Intrinsic colour indices of O- and B-type stars in the Vilnius photometric system

1994 ◽  
Vol 3 (1-2) ◽  
Author(s):  
J. Sūdžius ◽  
V. Bobinas
Keyword(s):  
Photometric System ◽  
Intrinsic Colour ◽  
Colour Indices

Ultraviolet intrinsic colour indices of O- and B-type stars

1994 ◽  
Vol 3 (1-2) ◽  
Author(s):  
V. Bobinas ◽  
J. Sūdžius
Keyword(s):  
Intrinsic Colour ◽  
Colour Indices

scholarly journals Astrometric and photometric observations of six brightest trans-Neptunian objects at the Kyiv comet station

2020 ◽  
Vol 10 (2) ◽  
pp. 48-54
Author(s):  
A. Baransky ◽  
O. Lukina ◽  
S. Borysenko
Keyword(s):  
Ccd Camera ◽  
Photometric System ◽  
Photometric Observations ◽  
Absolute Magnitudes ◽  
Colour Indices

In this work we focused on observations of six trans-Neptunian objects (TNOs) whose apparent magnitudes are brighter than 20m. We present the results of astrometric and photometric observations of (134340) Pluto, (136108) Haumea, (136472) Makemake, (136199) Eris, (90482) Orcus, and (20000) Varuna obtained at the Kyiv comet station (Code MPC 585) in 2017-2019. For observations we used the 0.7-m (f/4) reflector AZT-8 with FLI PL4710 CCD camera and filters of Johnson-Cousins photometric system. From our images we measured the objects' astrometric positions, calculated apparent magnitudes in the BVRI (mostly R) bands using aperture photometry method, and found absolute magnitudes together with the colour indices in several bands. Analysing our results, we investigate the limitation on the astrometry and photometry of faint objects with the 0.7-m telescope.

A photometric and spectrophotometric investigation of the central parts of the Norma Cloud

1966 ◽  
Vol 24 ◽  
pp. 338-339
Author(s):  
J. M. Ramberg
Keyword(s):  
Spectrophotometric Investigation ◽  
Photometric System ◽  
Plate Material ◽  
Objective Prism ◽  
Colour Indices

The author has for some time at the Stockholm Observatory been occupied in a photometric and spectrophotometric investigation of the central parts of the Norma Cloud of stars (α = 16h19m5, δ = −52°). The plate material has been collected at the Boyden Observatory: the spectral plates have been secured with the ADH telescope combined with objective prism, the photometric plates with the ADH and the 10-inch Metcalf telescopes. The photographic magnitudes and the colour indices are referred to the photometric system of the E-regions, as established by the Cape Observatory.

scholarly journals Passbands and Photometric Systems

1986 ◽  
Vol 7 ◽  
pp. 813-817
Author(s):  
F. Rufener
Keyword(s):  
The Other ◽  
Systematic Evaluation ◽  
Evaluation Procedure ◽  
Photometric System ◽  
Other Hand ◽  
The One ◽  
Colour Indices

AbstractSynthetic photometry must be used to accurately define the passbands which characterize a photometric system. On the one hand, the colour indices of the stars must be coherent with their absolute spectrophotometry; on the other hand, direct comparisons of model atmospheres with observations must be carried out without resorting to arbitrary transformations. A systematic evaluation procedure could be applied to various photometric systems.

Desiderata in connection by the calibration of the MK-system

1966 ◽  
Vol 24 ◽  
pp. 348-349
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Absolute Magnitude ◽  
Review Article ◽  
Stellar Systems ◽  
Astronomical Data ◽  
Intrinsic Colour

This is only an informal remark about some difficulties I am worrying about.I have tried to recalibrate the MK system in terms of intrinsic colour (B–V)0and absolute magnitudeMv. The procedures used have been described in a review article by Voigt (Mitt. Astr. Ges.1963, p. 25–35), and the results for stars of the luminosity classes Ia-O,I and II have been given also in Blaauw's article on the calibration of luminosity criteria in vol. III (Basic Astronomical Data, p. 401) ofStars and Stellar Systems.

scholarly journals Observed Relations Between Physical Properties and MK Classification as Functions of Metal Abundance for F5-K4 Stars

1976 ◽  
Vol 72 ◽  
pp. 75-78
Author(s):  
M. Grenon
Keyword(s):  
Physical Properties ◽  
Spectral Range ◽  
Spectral Type ◽  
Photometric System ◽  
Luminosity Class ◽  
Empirical Relations ◽  
Metal Abundance ◽  
Systematic Effects ◽  
The Absolute ◽  
Absolute Magnitudes

The Geneva photometric system has been calibrated in terms of [M/H], θeff, Mv in the spectral range F5 to K4. As the spectral type is a datum generally available, we derive empirical relations showing the coupling of θeff and [M/H] at given spectral type and luminosity class. Similar relations are offered for the absolute magnitudes and provide a more accurate means for deriving spectroscopic parallaxes. Systematic effects on the estimation of the luminosity class are also shown.

Sign in / Sign up

Export Citation Format

Share Document