Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94.1291b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 94, Nov. 1987, p. 1291-1298. NSF-supported research.
Astronomy and Astrophysics
Astronomy
12
Astronomical Photometry, Dwarf Novae, Eclipsing Binary Stars, Infrared Photometry, Accretion Disks, Brightness Temperature, Light Curve, Red Dwarf Stars, Stellar Color, Variability, White Dwarf Stars
Scientific paper
This paper presents simultaneous visual (V) and infrared (H) photometry of the eclipsing dwarf nova binary HT Cas during two eclipses in October 1985, and infrared (JHK) photometry out of eclipse in January 1986. These are the first infrared observations of this object. They require that the red dwarf is fainter than Fν = 0.5 mJy at H(H = 15.7), and that the system is at least 215 pc away, for a red dwarf radius of RR = 0.15 R_sun;. At this distance, the white dwarf has a brightness temperature at V of Tb = 26000K. The accretion disk around the white dwarf is highly variable from epoch to epoch: it was 70% brighter at H in January 1986 than in October 1985. Such variability in a quiescent system is unprecedented. The disk consisted of optically thin material in January, when it had a kinetic temperature of Tkin = 10000 - 20000K, and was most likely optically thin in October too.
Berriman Graham
Boyle Charles
Kenyon Scott
No associations
LandOfFree
Visual and infrared photometry of the ultrashort-period dwarf nova HT Cassiopeiae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Visual and infrared photometry of the ultrashort-period dwarf nova HT Cassiopeiae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Visual and infrared photometry of the ultrashort-period dwarf nova HT Cassiopeiae will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1713125