Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.0320p&link_type=abstract
American Astronomical Society, AAS Meeting #211, #03.20; Bulletin of the American Astronomical Society, Vol. 39, p.726
Astronomy and Astrophysics
Astronomy
Scientific paper
FY CMa (HD 58978, HR 2855) is a classical B0.5e star with a long history of emission and shell line variability in the optical and UV regions (Peters, ApJ, 331, L33, 1988; Grady et al., ESA SP-281, 1, 257, 1988, Cao, CJA&A, 1, 514, 2001). We have combined spectroscopic data from the KPNO Coudé Feed Telescope and the IUE spacecraft spanning the time intervals 1985-2006 and 1979-95, respectively, to confirm that it is a binary system containing a Be star and a hot subdwarf that is the stripped down core of a companion that transferred a significant amount of its mass to the Be mass gainer. A cross-correlation technique applied to the IUE spectra was used to detect the signal from the secondary and determine the radial velocity curves for both components. The spectrum of the secondary was reconstructed using a Doppler tomography algorithm. We confirm the period of 37.25 days found by Rivinius et al. (A&A, 427, 307, 2004) and find the stellar parameters listed in the table below. The emission line flux in He I and its radial velocity behavior suggest that most of this emission is formed in the portion of the rim of the Be star's disk that faces the hot subdwarf. Shell features that are redshifted relative to the primary by 30-80 km/s are seen in about half of the IUE spectra, but there appears to be no phase dependence. An empirical model will be presented for the system. We appreciate support from NSF grant AST-0606861 to Georgia State University and institutional grants from GSU and the USC Women in Science & Engineering program.
Gies Douglas R.
Grundstrom Erika D.
McSwain Virgina M.
Peters Geraldine Joan
No associations
LandOfFree
Detection of a Hot Subdwarf Companion to the Be Star FY Canis Majoris 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 Detection of a Hot Subdwarf Companion to the Be Star FY Canis Majoris, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detection of a Hot Subdwarf Companion to the Be Star FY Canis Majoris will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1473830