2001PASP..113..754Q


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET18:45:07

2001PASP..113..754Q - Publ. Astron. Soc. Pac., 113, 754-763 (2001/June-0)

Period studies of some neglected close binaries: EP Andromedae, V724 Aquilae, SS Comae, AM Eridani, FZ Orionis, BY Pegasi, EQ Tauri, and NO Vulpeculae.

QIAN S. and MA Y.

Abstract (from CDS):

Orbital period changes of eight neglected short-period close binaries, EP And, V724 Aql, SS Com, AM Eri, FZ Ori, BY Peg, EQ Tau, and NO Vul, are presented based on the analysis of their O-C observations. It is found that the periods of BY Peg and EQ Tau are decreasing at rates of dP/dt=-1.67x10–7 and -1.72x10–7 day.yr–1, respectively, while the orbital periods of SS Com and AM Eri show secular increase at rates of dP/dt=+5.91x10–7 and +4.39x10–7 day.yr–1. Weak evidence also indicates that the orbital period of EP And is increasing. For FZ Ori, the decrease rate of orbital period is revised. For the other two systems, V724 Aql and NO Vul, their O-C curve can be described by a sudden period decrease or a continuous period decrease; further investigation is needed. The period changes of the eight systems can be explained by mass transfer between the two components and/or mass and angular momentum loss from these binaries. A strong mass-radius relation for observed contact binaries is formed based on the parameters given by Maceroni & Van't Veer. It is shown that the parameters of SS Com and EQ Tau given by Brancewicz & Dworak do not agree with the mass-radius relation. This may suggest that the two systems are not yet in contact. In order to understand the physical properties of these binaries, complete photoelectric or CCD light curves and radial velocity observations are needed.

Abstract Copyright:

Journal keyword(s): stars: individual (EP Andromedae) - stars: individual (V724 Aquilae, SS Comae) - stars: individual (AM Eridani) - stars: individual (FZ Orionis) - stars: individual (BY Pegasi) - stars: individual (EQ Tauri) - stars: individual (NO Vulpeculae)

Simbad objects: 21

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Number of rows : 21

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* EP And EB* 01 42 29.3381398172 +44 45 42.455589306   11.81 11.40     F8V 56 0
2 V* EQ Tau EB* 03 48 13.4354607957 +22 18 50.923195066   12.04 11.18     G1 112 0
3 V* YY Eri EB* 04 12 08.8494411846 -10 28 09.993813939   9.08 8.41   7.673 G3/K0+(F/G) 208 0
4 V* AM Eri EB* 04 29 50.9824883113 -12 14 23.125938032     13.59     ~ 8 0
5 V* FZ Ori WU* 05 41 21.0048571059 +02 36 22.926329607   11.18 10.53     G0 53 0
6 V* V781 Tau EB* 05 50 13.1257943382 +26 57 43.362139205   9.28 8.67   7.976 G0 98 0
7 V* Y Sex WU* 10 02 47.9689716565 +01 05 40.183887562   10.38 9.95 9.875   F3/5V 101 0
8 V* SS Com EB* 12 49 39.0825345901 +18 42 11.887162482   11.33 11.00     F5 54 0
9 V* CK Boo EB* 14 35 03.7594697546 +09 06 49.375637476   9.61 9.029   8.414 F7/8V 123 0
10 V* TZ Boo EB* 15 08 09.1344964536 +39 58 12.864002715   10.60       G2Vn 194 0
11 V* V502 Oph EB* 16 41 20.8609964438 +00 30 27.383882425   9.15 8.50   7.865 G2V+F9V 177 0
12 V* V566 Oph WU* 17 56 52.4104254187 +04 59 15.324800914   8.03 7.58     F5V 241 0
13 V* V839 Oph EB* 18 09 21.2653297696 +09 09 03.605427060   9.62 9.03   8.286 F8V 132 0
14 V* V401 Cyg WU* 19 29 20.2727911200 +30 24 28.462721118   11.04 10.70     F0 92 0
15 V* NO Vul EB* 19 34 37.9954468813 +20 37 14.275846814   13.4 12.835     ~ 26 0
16 V* V724 Aql EB* 19 56 42.7069726688 +01 05 03.696975030   11.81 11.37     A2 22 0
17 V* VW Cep EB* 20 37 21.6248469581 +75 36 01.889162699   8.13   7.0   G8V+K0V 528 0
18 V* DK Cyg EB* 21 35 02.6694770300 +34 35 45.398785963   10.98 10.56     A6V 131 0
19 V* BY Peg EB* 21 38 52.1407188821 +28 05 45.160578154   13.57 12.37 12.313   ~ 29 0
20 V* AB And EB* 23 11 32.0860884375 +36 53 35.107206154   10.62 9.50     G5+G5V 255 0
21 V* U Peg EB* 23 57 58.4767547238 +15 57 10.083936262   10.26 9.63   8.970 G2V 237 0

    Equat.    Gal    SGal    Ecl

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2021.03.05-18:45:07

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