Radial Velocity Studies of Close Binary Stars.XIII

Abstract

Radial-velocity measurements and sine-curve fits to the orbital radial velocity variations are presented for ten close binary systems: EG Cep,V1191 Cyg, V1003 Her, BD+7_3142, V357 Peg, V407 Peg, V1123 Tau, V1128 Tau, HH UMa, and PY Vir. While most of the studied eclipsing systems are contact binaries, EG Cep is a detached or a semi-detached double-lined binary and V1003 Her is a close binary of an uncertain type seen at a very low inclination angle. We discovered two previously unknown triple systems, BD+7_3142 and PY Vir, both with late spectral-type (K2V) binaries. Of interest is the low-mass ratio (q = 0.106) close binary V1191 Cyg showing an extremely fast period increase; the system has a very short period for its spectral type and shows a W-type light curve, a feature rather unexpected for such a low mass-ratio system.

Accepted by AJ. 19 pages including 5 figures

References in corpus (3)

• Contact Binaries with Additional Components.I. The Extant Data
• Radial Velocity Studies of Close Binary Stars. XI
• Radial Velocity Studies of Close Binary Stars. XII

Cited by in corpus (11)

• Radial Velocity Studies of Close Binary Stars. XIV
• Physical parameters of close binary systems: VIII
• Starspots in contact and semi-detached binary systems
• Physical Parameters of Some Close Binaries: ET Boo, V1123 Tau, V1191 Cyg, V1073 Cyg and V357 Peg
• Photometric analysis of overcontact binaries AK Her, HI Dra, V1128 Tau and V2612 Oph
• A catalog of visual double and multiple stars with eclipsing components
• Marginally low mass ratio close binary system V1191 Cyg
• Comparative study of TESS photometry and radial velocities on six early K-type contact binaries with similar periods around 0.268 days
• DDO spectroscopic survey of MOST variable stars
• Photometric Investigation of Contact Binary DY Cet Based on TESS Data
• Photometric and spectroscopic studies of the long period low mass ratio deep contact binary KN Per