scholarly journals The young open cluster NGC 7067 using Strömgren photometry

2016 ◽  
Vol 466 (3) ◽  
pp. 3636-3647 ◽  
Author(s):  
M Monguió ◽  
I Negueruela ◽  
A Marco ◽  
C González-Fernández ◽  
J Alonso-Santiago ◽  
...  
Keyword(s):  
Spectroscopic Data ◽  
Milky Way ◽  
Open Cluster ◽  
Physical Parameters ◽  
Wide Field ◽  
Isaac Newton ◽  
Cluster Distance ◽  
Young Open Cluster ◽  
Isaac Newton Telescope ◽  
Spiral Arm

Abstract NGC 7067 is a young open cluster located in the direction between the first and the second Galactic quadrants and close to the Perseus spiral arm. This makes it useful for studies of the nature of the Milky Way spiral arms. Strömgren photometry taken with the Wide Field Camera at the Isaac Newton Telescope allowed us to compute individual physical parameters for the observed stars and hence to derive the cluster's physical parameters. Spectra from the 1.93-m telescope at the Observatoire de Haute-Provence helped to check and improve the results. We obtained photometry for 1233 stars, individual physical parameters for 515 and spectra for 9 of them. The 139 selected cluster members lead to a cluster distance of 4.4 ± 0.4 kpc, with an age below log10(t(yr)) = 7.3 and a present mass of 1260 ± 160 M⊙. The morphology of the data reveals that the centre of the cluster is at (α, δ) = (21: 24: 13.69, +48: 00: 39.2) J2000, with a radius of 6.1 arcmin. Strömgren and spectroscopic data allowed us to improve the previous parameters available for the cluster in the literature.

The Isaac Newton Telescope Wide Field Camera survey of the Monoceros Ring: accretion origin or Galactic anomaly?

2005 ◽  
Vol 362 (2) ◽  
pp. 475-488 ◽  
Author(s):  
Blair C. Conn ◽  
Geraint F. Lewis ◽  
Mike J. Irwin ◽  
Rodrigo A. Ibata ◽  
Annette M. N. Ferguson ◽  
...  
Keyword(s):  
Wide Field ◽  
Isaac Newton ◽  
Isaac Newton Telescope

A Search for Brown Dwarfs in the Alpha Persei Cluster

2003 ◽  
Vol 211 ◽  
pp. 179-180
Author(s):  
Nicolas Lodieu ◽  
Mark McCaughrean ◽  
Jérôme Bouvier ◽  
David Barrado y Navascués ◽  
John R. Stauffer
Keyword(s):  
Near Infrared ◽  
Open Cluster ◽  
Brown Dwarfs ◽  
Wide Field ◽  
Brown Dwarf ◽  
Young Open Cluster ◽  
Low Mass ◽  
Alpha Persei ◽  
Calar Alto ◽  
Infrared Survey

We present preliminary results from a deep near-infrared survey of a ~ 1 square degree area in the young open cluster Alpha Persei using the wide-field Omega-Prime camera on the Calar Alto 3.5m telescope, yielding a list of new low-mass cluster members, including brown dwarf candidates.

scholarly journals The Young Open Cluster NGC 2384

1984 ◽  
Vol 78 ◽  
pp. 295-299
Author(s):  
S.M. Hassan
Keyword(s):  
Spectral Type ◽  
Open Cluster ◽  
Apparent Distance ◽  
Distance Modulus ◽  
Colour Excess ◽  
Young Open Cluster ◽  
Ubv Photometry ◽  
Spiral Arm

AbstractCombined photoelectric – photographic UBV-photometry for NGC 2384 is discussed. The results achieved so far are summarized and indicate that this cluster is young enough to be used as spiral arm tracer out to a distance of 3.27 kpc. The colour excess E(B-V) is 0.31, the apparent distance modulus is 13m.50 and its earliest spectral type is BO.

scholarly journals SiO maser astrometry of the red transient V838 Monocerotis

2020 ◽  
Vol 638 ◽  
pp. A17
Author(s):  
Gisela N. Ortiz-León ◽  
Karl M. Menten ◽  
Tomasz Kamiński ◽  
Andreas Brunthaler ◽  
Mark J. Reid ◽  
...  
Keyword(s):  
Proper Motion ◽  
Milky Way ◽  
Thermal Emission ◽  
Open Cluster ◽  
Distance Information ◽  
Geometric Distance ◽  
Maser Emission ◽  
Long Baseline ◽  
Very Long Baseline Array ◽  
Spiral Arm

We present multiepoch observations with the Very Long Baseline Array of SiO maser emission in the v = 1, J = 1−0 transition at 43 GHz from the remnant of the red nova V838 Mon. We modeled the positions of maser spots to derive a parallax of 0.166 ± 0.060 mas. Combining this parallax with other distance information results in a distance of 5.6 ± 0.5 kpc, which is in agreement with an independent geometric distance of 6.1 ± 0.6 kpc from modeling polarimetry images of V838 Mon’s light echo. Combining these results, and including a weakly constraining Gaia parallax, yields a best estimate of distance of 5.9 ± 0.4 kpc. The maser spots are located close to the peaks of continuum at ∼225 GHz and SiO J  =  5−4 thermal emission detected with the Atacama Large (sub)Millimeter Array. The proper motion of V838 Mon confirms its membership in a small open cluster in the Outer spiral arm of the Milky Way.

scholarly journals IC 361, a distant intermediate-age cluster in Camelopardalis

2009 ◽  
Vol 5 (S266) ◽  
pp. 557-560
Author(s):  
Justas Zdanavičius ◽  
Richard P. Boyle ◽  
Frederick J. Vrba ◽  
Kazimieras Zdanavičius ◽  
Stanislava Bartašiūtė
Keyword(s):  
Open Cluster ◽  
Interstellar Extinction ◽  
Distance Modulus ◽  
Ccd Photometry ◽  
True Distance ◽  
Individual Stars ◽  
Cluster Distance ◽  
Spiral Arm

AbstractWe have undertaken CCD photometry in the eight-color Vilnius + I system for the open cluster IC 361 (l = 147.5°, b = 5.7°) located in the constellation of Camelopardalis. Based on multicolor data, estimates of distance moduli, foreground reddening and metallicity have been obtained for individual stars measured in the field of the cluster. This allowed us to eliminate most of the field stars and to identify the probable cluster members, from which we derived the true distance modulus (m − M)0 = 12.7 mag and metallicity [Fe/H] = −0.3 dex. The interstellar extinction is found to be nonuniform across the field, with values of AV ranging from 1.9 to 2.6 mag. A comparison of the color–magnitude diagrams with Padova isochrones yields (m − M)0 = 12.6 mag, or a cluster distance of 3.3 kpc, and an age of 1.0 Gyr. Therefore, IC 361 appears to be a mildly metal-deficient cluster of intermediate age, located as far as, or just beyond, the Perseus spiral arm.

scholarly journals The dwarf galaxy population in nearby clusters from the KIWICS survey

2021 ◽  
Vol 507 (4) ◽  
pp. 6045-6060
Author(s):  
Nelvy Choque-Challapa ◽  
J Alfonso L Aguerri ◽  
Pavel E Mancera Piña ◽  
Reynier Peletier ◽  
Aku Venhola ◽  
...  
Keyword(s):  
Dwarf Galaxy ◽  
Structural Parameters ◽  
Wide Field ◽  
Isaac Newton ◽  
Cluster Centre ◽  
Cluster Environment ◽  
Low Mass ◽  
Isaac Newton Telescope ◽  
Galaxy Population ◽  
Inner Region

ABSTRACT We analyse a sample of 12 galaxy clusters, from the Kapteyn IAC WEAVE INT Cluster Survey (KIWICS) looking for dwarf galaxy candidates. By using photometric data in the r and g bands from the Wide Field Camera (WFC) at the 2.5-m Isaac Newton Telescope (INT), we select a sample of bright dwarf galaxies (M$_r\, \le$ −15.5 mag) in each cluster and analyse their spatial distribution, stellar colour, and as well as their Sérsic index and effective radius. We quantify the dwarf fraction inside the R200 radius of each cluster, which ranges from ∼0.7 to ∼0.9. Additionally, when comparing the fraction in the inner region with the outermost region of the clusters, we find that the fraction of dwarfs tends to increase going to the outer regions. We also study the clustercentric distance distribution of dwarf and giant galaxies (M$_r\, \lt $ −19.0 mag), and in half of the clusters of our sample, the dwarfs are distributed in a statistically different way as the giants, with the giant galaxies being closer to the cluster centre. We analyse the stellar colour of the dwarf candidates and quantify the fraction of blue dwarfs inside the R200 radius, which is found to be less than ∼0.4, but increases with distance from the cluster centre. Regarding the structural parameters, the Sérsic index for the dwarfs we visually classify as early-type dwarfs tends to be higher in the inner region of the cluster. These results indicate the role that the cluster environment plays in shaping the observational properties of low-mass haloes.

scholarly journals Young open cluster IC 4996 and its vicinity: multicolor photometry and Gaia DR2 astrometry

2019 ◽  
Vol 623 ◽  
pp. A22 ◽  
Author(s):  
V. Straižys ◽  
R. P. Boyle ◽  
K. Milašius ◽  
K. Černis ◽  
M. Macijauskas ◽  
...  
Keyword(s):  
Open Cluster ◽  
Interstellar Extinction ◽  
Mean Value ◽  
Photometric System ◽  
B Stars ◽  
Dust Clouds ◽  
Wide Range ◽  
Cluster Distance ◽  
Young Open Cluster ◽  
Similar Distance

The open cluster IC 4996 in Cygnus and its vicinity are investigated by applying a two-dimensional photometric classification of stars measured in the Vilnius seven-color photometric system. Cluster members are identified by applying distances based on the Gaia DR2 parallaxes and the point vector diagram of the Gaia DR2 proper motions. For some B-type stars, spectroscopic MK types are also obtained from the Asiago spectra and collected from the literature. New parameters of the cluster are derived. The interstellar extinction AV covers a wide range of values, from 1.3 to 2.4 mag; the mean value in the central part of the cluster is 1.8 mag. The cluster distance is 1915 ± 110 pc, and its age is within 8–10 Myr. The cluster exhibits a long sequence from early-B to G stars, where stars cooler than B8 are in the pre-main-sequence stage. The plot of extinction versus distance shows a steep rise of AV up to 1.6 mag at 700–800 pc, which is probably related to dust clouds at the edge of the Great Cygnus Rift. The next increase in extinction by an additional 0.8 mag at d ≥ 1.7 kpc is probably related to the associations Cyg OB1 and Cyg OB3. The cluster IC 4996 does not belong to the Cyg OB1 association, which is located closer to the Sun, at 1682 ± 116 pc. It seems likely that the cluster and the surrounding O-B stars have a common origin with the nearby association Cyg OB3 since Gaia data show that these stellar groups are located at a similar distance.

scholarly journals Global survey of star clusters in the Milky Way: The open cluster distance scale

2012 ◽  
Vol 8 (S289) ◽  
pp. 394-397
Author(s):  
N. V. Kharchenko ◽  
A. E. Piskunov ◽  
S. Röser ◽  
E. Schilbach ◽  
R.-D. Scholz
Keyword(s):  
Globular Clusters ◽  
Near Infrared ◽  
Milky Way ◽  
Galactic Disk ◽  
Open Cluster ◽  
Star Clusters ◽  
Optical Data ◽  
Target List ◽  
Good Opportunity ◽  
Cluster Distance

AbstractWe present the Milky Way Star Clusters (MWSC) survey based on 470 million stars extracted from the all-sky catalogues PPMXL and 2mass. The target list comprises 3784 entries and includes all open and globular clusters, as well as all cluster candidates, known at present. By means of a combined photometric/astrometric pipeline process, we determine individual membership probabilities for cluster stars and provide fundamental cluster parameters such as cluster centre coordinates, mean proper motions, radial velocity, distance, reddening, age and tidal radius. This sample includes ~ 700 clusters with fundamental parameters based on optical data and offers a good opportunity for a comparison of the near-infrared (NIR) and optical cluster distance scales. We find that distances and reddening values obtained from the colour–magnitude diagrams (CMDs) in the NIR agree well with earlier distance estimates based on optical CMDs. These newly obtained homogeneous distances, together with the other cluster parameters, allow us to study the properties of the open cluster population in the Galactic disk.

First Results From the Local Group Census: Planetary Nebulae in Sextans B

2003 ◽  
Vol 209 ◽  
pp. 561-561
Author(s):  
R.L.M. Corradi ◽  
L. Magrini ◽  
N. A. Walton ◽  
A. A. Zijlstra ◽  
J. R. Walsh ◽  
...  
Keyword(s):  
Field Survey ◽  
Local Group ◽  
Planetary Nebulae ◽  
Field Of View ◽  
Wide Field ◽  
Isaac Newton ◽  
First Results ◽  
Isaac Newton Telescope

The Local Group Census is a narrowband survey of all the galaxies of the Local Group (LG) with Dec ≥ −30°, being carried out as part of the Isaac Newton Group's Wide Field Survey programme. Observations are being obtained with the Wide Field Camera at the 2.5m Isaac Newton telescope, equipped with a mosaic of four 2k x 4k EEV CCDs covering a field of view of 34′ x 34′.

scholarly journals 280 one-opposition near-Earth asteroids recovered by the EURONEAR with the Isaac Newton Telescope

2018 ◽  
Vol 609 ◽  
pp. A105 ◽  
Author(s):  
O. Vaduvescu ◽  
L. Hudin ◽  
T. Mocnik ◽  
F. Char ◽  
A. Sonka ◽  
...  
Keyword(s):  
Moving Objects ◽  
Wide Field ◽  
Minor Planets ◽  
Main Belt ◽  
Isaac Newton ◽  
Isaac Newton Telescope ◽  
Fast Motion ◽  
The One ◽  
Near Earth Asteroids

Context. One-opposition near-Earth asteroids (NEAs) are growing in number, and they must be recovered to prevent loss and mismatch risk, and to improve their orbits, as they are likely to be too faint for detection in shallow surveys at future apparitions. Aims. We aimed to recover more than half of the one-opposition NEAs recommended for observations by the Minor Planet Center (MPC) using the Isaac Newton Telescope (INT) in soft-override mode and some fractions of available D-nights. During about 130 h in total between 2013 and 2016, we targeted 368 NEAs, among which 56 potentially hazardous asteroids (PHAs), observing 437 INT Wide Field Camera (WFC) fields and recovering 280 NEAs (76% of all targets). Methods. Engaging a core team of about ten students and amateurs, we used the THELI, Astrometrica, and the Find_Orb software to identify all moving objects using the blink and track-and-stack method for the faintest targets and plotting the positional uncertainty ellipse from NEODyS. Results. Most targets and recovered objects had apparent magnitudes centered around V ~ 22.8 mag, with some becoming as faint as V ~ 24 mag. One hundred and three objects (representing 28% of all targets) were recovered by EURONEAR alone by Aug. 2017. Orbital arcs were prolonged typically from a few weeks to a few years; our oldest recoveries reach 16 years. The O−C residuals for our 1854 NEA astrometric positions show that most measurements cluster closely around the origin. In addition to the recovered NEAs, 22 000 positions of about 3500 known minor planets and another 10 000 observations of about 1500 unknown objects (mostly main-belt objects) were promptly reported to the MPC by our team. Four new NEAs were discovered serendipitously in the analyzed fields and were promptly secured with the INT and other telescopes, while two more NEAs were lost due to extremely fast motion and lack of rapid follow-up time. They increase the counting to nine NEAs discovered by the EURONEAR in 2014 and 2015. Conclusions. Targeted projects to recover one-opposition NEAs are efficient in override access, especially using at least two-meter class and preferably larger field telescopes located in good sites, which appear even more efficient than the existing surveys.

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