2007AJ....133.1934A


Query : 2007AJ....133.1934A

2007AJ....133.1934A - Astron. J., 133, 1934-1946 (2007/May-0)

Late-type near-contact eclipsing binary [HH97] FS Aur-79.

AUSTIN S.J., ROBERTSON J.W., TYCNER C., CAMPBELL T. and HONEYCUTT R.K.

Abstract (from CDS):

The secondary photometric standard star number 79 for the FS Aur field (Henden & Honeycutt (ref???)1997), designated as [HH97] FS Aur-79 (GSC 1874-399), is a short-period (0.2508 days) eclipsing binary whose light curve is a combination of the β Lyr and BY Dra type variables. High signal-to-noise ratio multicolor photometry was obtained using the US Naval Observatory 1 m telescope. These light curves show asymmetry at quadrature phases (the O'Connell effect), which can be modeled with the presence of starspots. A low-resolution spectrum obtained with the 3.5 m Wisconsin-Indiana-Yale-NOAO telescope at orbital phase 0.76 is consistent with a spectral type of dK7e and dM3e. A radial velocity curve for the primary star was constructed using 24 high-resolution spectra from the 9.2 m Hobby-Eberly Telescope. Spectra show Hα and Hβ in emission confirming chromospheric activity and possibly the presence of circumstellar material. Binary star models that simultaneously fit the U, B, V, R, and radial velocity curves are those with a primary star of mass 0.59±0.02 M, temperature 4100±25 K, and mean radius 0.67 R, just filling its Roche lobe, and a secondary star of mass 0.31±0.09 M, temperature 3425±25 K, and mean radius 0.48 R, just within its Roche lobe. An inclination angle of 83°±2° with a center-of-mass separation of 1.62 R is also derived. Starspots, expected for a rotation period of less than 1 day, had to be included in the modeling to fit the O'Connell effect.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: Close - Stars: Binaries: Eclipsing - Stars: Binaries: Spectroscopic - Stars: Late-Type

CDS comments: [HH97] FS Aur-79 = [HH95] FS Aur-79

Simbad objects: 17

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Number of rows : 17
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 CD-34 239 PM* 00 41 30.4739854200 -33 37 32.030888686 13.138 11.969 10.525 9.619 8.741 K9V 106 0
2 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3260 0
3 LP 995-86 PM* 03 48 22.6125679056 -39 08 37.013680104   13.61 13.15     F 95 0
4 [HH95] FS Aur-63 * 05 47 44.9 +28 31 00   13.287 12.837     ~ 4 0
5 V* FS Aur CV* 05 47 48.3599178816 +28 35 11.207992848           ~ 101 0
6 [HH95] FS Aur-62 * 05 47 51.1 +28 30 19   14.062 13.650     ~ 4 0
7 V* V1374 Tau EB* 05 48 03.8495416848 +28 30 47.420902116   13.7 13.679     dK7e+dM3e 10 0
8 L 595-22 PM* 05 56 24.7419040752 -27 51 32.361761700   12.31 12.38     sdG 159 0
9 RX J0618.1+7506 LM* 06 18 07.2591684720 +75 06 03.287075184   12.79 11.31 10.97   M2.0Ve 28 0
10 V* YY Gem BY* 07 34 37.4474327544 +31 52 10.179641496 11.60 10.56 9.27 7.69 6.67 M0.5VeFe-2 842 0
11 V* CU Cnc SB* 08 31 37.5741841080 +19 23 39.398029332   12.83 11.809 11.592   M5Ve 211 0
12 * 36 UMa B PM* 10 30 25.3088805072 +55 59 56.855409072   10.10   8.749   K7Ve 125 1
13 V* W Crv EB* 12 07 34.3580942256 -13 08 59.009877636   11.95 11.28     ~ 73 0
14 V* CM Dra BY* 16 34 20.3302660573 +57 09 44.368918696   14.50 12.87 10.85 9.26 M4.5V 427 0
15 OGLE BW3 V38 EB* 18 04 44.2025491872 -30 09 05.497738668     18.300   16.3335 ~ 43 0
16 HD 204445 V* 21 28 24.8381812536 +08 11 44.331741312   8.06 6.41     M1 30 0
17 V* VZ Psc EB* 23 27 48.3881626645 +04 51 23.937175287   11.39 10.274 10.090 8.926 K4/5V 109 0

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2022.11.26-10:58:20

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