Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...354..909k&link_type=abstract
Astronomy and Astrophysics, v.354, p.909-914 (2000)
Astronomy and Astrophysics
Astrophysics
8
Publications, Bibliography, Book Reviews, Book Reviews, Stars: Binaries: Eclipsing, Book Reviews, Stars: Individual: Xy Uma, Book Reviews, Stars: Luminosity Function, Mass Function, Book Reviews, Stars: Starspots, Magnetohydrodynamics (Mhd)
Scientific paper
BVRI photometry and Hα -line spectroscopy of the short-period RS CVn-binary XY UMa are presented. The light curves as a whole as well as the two eclipse minima are asymmetric. The light level after the primary minimum is lower by about 0.04-0.05 mag than that after the secondary one. Two cool spots on the primary with sizes 20degr and 10degr , temperatures 4630 and 4330 K at middle latitudes reproduced well the distortion curve in all colours. The observed Hα profile is quite wide and asymmetric at most the phases out of the eclipses. The radial velocity curve is sinusoidal with semiamplitude K1=120.7+/- 2.9 km/s. The corresponding mass function of the system is 0.082Msun . The phase behaviour of the Hα -profile implies contribution of emission of the chromospheric regions above the photospheric spots.
Kjurkchieva Diana
Marchev Dobrin
Ogloza Waldemar
No associations
LandOfFree
Multicolour high-speed photometry and Hα spectroscopy of XY UMa 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 Multicolour high-speed photometry and Hα spectroscopy of XY UMa, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multicolour high-speed photometry and Hα spectroscopy of XY UMa will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1491201