2001MNRAS.325..617L

Query : 2001MNRAS.325..617L

2001MNRAS.325..617L - Mon. Not. R. Astron. Soc., 325, 617-630 (2001/August-1)

uvbyβ photometry of the short-period binary VV Ursae Majoris.

LAZARO C., AREVALO M.J., CLARET A., RODRIGUEZ E. and OLIVARES I.

Abstract (from CDS):

We present well-sampled uvby light curves, supplemented by a few β filter measurements, of the Algol binary VV UMa. The light curves are analysed using two different codes to derive the orbital and absolute stellar parameters of this binary. We find reasonably good fits to the light curves and determine the stellar effective temperatures Teff,1≃9000-9600K, and Teff,2≃5300-5600K with a mass ratio q≃0.35. From the light-curve fits we discard the possibility of an anomalous gravity-darkening exponent for the secondary star of this system, as previously suggested.

We find evidence of short-term, small-amplitude variations in the brightness of the system. Two periodicities of about 1.10 and 0.51h seem to be present in the data for at least two different nights, even within the secondary eclipse. This suggests that VV UMa may be a new Algol binary with a low-amplitude variable primary star, but new data collected during longer observing runs are necessary to confirm the pulsating nature of the brightness variations.


Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): binaries: general - stars: fundamental parameters - stars: individual: VV UMa - stars: oscillations

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 82861 * 09 36 42.8819738448 +56 58 12.581866488   7.196 7.049     Am 40 0
2 V* VV UMa SB* 09 38 06.7191516888 +56 01 07.288559904   10.42 10.28 10.135   A2V 141 0
3 BD+56 1396 * 09 38 32.2190153760 +55 52 06.515608404   10.55 10.17     ~ 7 0
4 HD 83886 PM* 09 43 06.9450161064 +54 21 49.323213972   6.589 6.477     A5m 51 0

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