Mid Infrared Variability of Herbig Ae/Be Stars

2003 ◽  
pp. 351-358
Author(s):  
Timo Prusti ◽  
Antonella Natta
Keyword(s):  
Be Stars ◽  
Mid Infrared

scholarly journals Mid-infrared sizes of circumstellar disks around Herbig Ae/Be stars measured with MIDI on the VLTI

2004 ◽  
Vol 423 (2) ◽  
pp. 537-548 ◽  
Author(s):  
Ch. Leinert ◽  
R. van Boekel ◽  
L. B. F. M. Waters ◽  
O. Chesneau ◽  
F. Malbet ◽  
...  
Keyword(s):  
Circumstellar Disks ◽  
Be Stars ◽  
Mid Infrared

scholarly journals Analysis of the B and Be-star populations of the double cluster h and χ Persei

2009 ◽  
Vol 5 (S266) ◽  
pp. 462-465
Author(s):  
Amber N. Marsh ◽  
M. Virginia McSwain ◽  
Thayne Currie
Keyword(s):  
Optical Spectra ◽  
Photometric Data ◽  
Be Stars ◽  
National Observatory ◽  
Mid Infrared ◽  
Be Star ◽  
Double Cluster

AbstractWe present blue optical spectra of 92 members of h and χ Per obtained with the WIYN telescope at Kitt Peak National Observatory. From these spectra, several stellar parameters were measured for the B-type stars, including v sin i, Teff, log gpolar, M∗, and R∗. Strömgren photometry was used to measure Teff and log gpolar for the Be stars. We also analyze photometric data of cluster members and discuss the near- to mid-infrared excesses of Be stars.

scholarly journals Mid-Infrared Spectra of Be Stars

2000 ◽  
Vol 175 ◽  
pp. 476-479
Author(s):  
S.A. Rinehart ◽  
J.R. Houck
Keyword(s):  
Simple Model ◽  
Infrared Spectra ◽  
Line Strength ◽  
Be Stars ◽  
Mid Infrared ◽  
Hydrogen Recombination ◽  
Medium Resolution ◽  
Line Widths

AbstractWe present medium-resolution (R ~ 600) mid-infrared (8-13.3μm) spectra of γ Cas and a coadded spectrum of nine Be stars. A large number of lines have been observed and identified in these spectra, including 39 hydrogen recombination lines in the spectrum of γ Cas. In the majority of our spectra, all of the observed lines are attributable to hydrogen recombination. Two additional sources, β Lyr and MWC 349, show [Ne II] emission and β Lyr also displays [He I] emission. We tabulate the effective line strength and line widths for the observed lines, and briefly discuss the physical implications of the observed line series. We also use a simple model of free-free emission to characterize the disks around these sources.

scholarly journals The inner gaseous accretion disk around a Herbig Be star revealed by near- and mid-infrared spectro-interferometry

2007 ◽  
Vol 3 (S243) ◽  
pp. 337-344
Author(s):  
S. Kraus ◽  
Th. Preibisch ◽  
K. Ohnaka
Keyword(s):  
Accretion Disk ◽  
Near Infrared ◽  
Spectral Energy Distribution ◽  
Continuum Emission ◽  
Spectral Energy ◽  
Be Stars ◽  
Radial Temperature ◽  
Mid Infrared ◽  
Be Star ◽  
Dust Disks

AbstractHerbig Ae/Be stars are pre-main-sequence stars of intermediate mass, which are still accreting material from their environment, probably via a disk composed of gas and dust. Here we present a recent study of the geometry of the inner (AU-scale) circumstellar region around the Herbig Be star MWC 147 using long-baseline interferometry. By combining for the first time near- and mid-infrared spectro-interferometry on a Herbig star, our VLTI/AMBER and VLTI/MIDI data constrain not only the geometry of the brightness distribution, but also the radial temperature distribution in the disk. The emission from MWC 147 is clearly resolved and has a characteristic physical size of ∼1.3 AU and ∼9 AU at 2.2 μm and 11 μm respectively. This increase in apparent size towards longer wavelengths is much steeper than predicted by analytic disk models assuming power-law radial temperature distributions. For a detailed modeling of the interferometric data and the spectral energy distribution of MWC 147, we employ 2-D frequency-dependent radiation transfer simulations. This analysis shows that passive irradiated Keplerian dust disks can easily fit the SED, but predict much lower visibilities than observed, so these models can clearly be ruled out. Models of a Keplerian disk with emission from an optically thick inner gaseous accretion disk (inside the dust sublimation zone), however, yield a good fit of the SED and simultaneously reproduce the observed near- and mid-infrared visibilities. We conclude that the near-infrared continuum emission from MWC 147 is dominated by accretion luminosity emerging from an optically thick inner gaseous disk, while the mid-infrared emission also contains strong contributions from the passive irradiated dust disk.

scholarly journals Searching for molecular hydrogen mid-infrared emission in the circumstellar environments of Herbig Be stars

2008 ◽  
Vol 489 (2) ◽  
pp. 601-605 ◽  
Author(s):  
C. Martin-Zaïdi ◽  
E. F. van Dishoeck ◽  
J.-C. Augereau ◽  
P.-O. Lagage ◽  
E. Pantin
Keyword(s):  
Molecular Hydrogen ◽  
Infrared Emission ◽  
Be Stars ◽  
Mid Infrared ◽  
Circumstellar Environments

Mid‐Infrared Spectra of Polycyclic Aromatic Hydrocarbon Emission in Herbig Ae/Be Stars

2005 ◽  
Vol 632 (2) ◽  
pp. 956-963 ◽  
Author(s):  
G. C. Sloan ◽  
L. D. Keller ◽  
W. J. Forrest ◽  
E. Leibensperger ◽  
B. Sargent ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Infrared Spectra ◽  
Be Stars ◽  
Mid Infrared ◽  
Polycyclic Aromatic ◽  
Hydrocarbon Emission ◽  
Polycyclic Aromatic Hydrocarbon Emission

scholarly journals Discovery of 2716 hot emission-line stars from LAMOST DR5

2021 ◽  
Vol 21 (11) ◽  
pp. 288
Author(s):  
Baskaran Shridharan ◽  
Blesson Mathew ◽  
Sabu Nidhi ◽  
Ravikumar Anusha ◽  
Roy Arun ◽  
...  
Keyword(s):  
Emission Line ◽  
Near Infrared ◽  
Community Study ◽  
Be Stars ◽  
Mid Infrared ◽  
Data Release ◽  
Homogeneous Set ◽  
Stellar Parameter ◽  
Infrared Wavelengths

Abstract We present a catalog of 3339 hot emission-line stars (ELSs) identified from 451 695 O, B and A type spectra, provided by LAMOST Data Release 5 (DR5). We developed an automated Python routine that identified 5437 spectra having a peak between 6561 and 6568 Å. False detections and bad spectra were removed, leaving 4138 good emission-line spectra of 3339 unique ELSs. We re-estimated the spectral types of 3307 spectra as the LAMOST Stellar Parameter Pipeline (LASP) did not provide accurate spectral types for these emission-line spectra. As Herbig Ae/Be stars exhibit higher excess in near-infrared and mid-infrared wavelengths than classical Ae/Be stars, we relied on 2MASS and WISE photometry to distinguish them. Finally, we report 1089 classical Be, 233 classical Ae and 56 Herbig Ae/Be stars identified from LAMOST DR5. In addition, 928 B[em]/A[em] stars and 240 CAe/CBe potential candidates are identified. From our sample of 3339 hot ELSs, 2716 ELSs identified in this work do not have any record in the SIMBAD database and they can be considered as new detections. Identification of such a large homogeneous set of emission-line spectra will help the community study the emission phenomenon in detail without worrying about the inherent biases when compiling from various sources.

HIGH-RESOLUTION MID-INFRARED IMAGING OF THE CIRCUMSTELLAR DISKS OF HERBIG Ae/Be STARS

2011 ◽  
Vol 737 (2) ◽  
pp. 57 ◽  
Author(s):  
N. Mariñas ◽  
C. M. Telesco ◽  
R. S. Fisher ◽  
C. Packham
Keyword(s):  
High Resolution ◽  
Infrared Imaging ◽  
Circumstellar Disks ◽  
Be Stars ◽  
Mid Infrared

AMICA: the Antarctic Mid-Infrared CAmera for the IRAIT telescope

2005 ◽  
Vol 14 ◽  
pp. 337-342 ◽  
Author(s):  
M. Dolci ◽  
G. Valentini ◽  
O. Straniero ◽  
G. Di Rico ◽  
M. Ragni ◽  
...  
Keyword(s):  
Infrared Camera ◽  
Mid Infrared ◽  
The Antarctic
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