1997A&AS..125..407A


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.07CEST21:55:14

1997A&AS..125..407A - Astron. Astrophys., Suppl. Ser., 125, 407-417 (1997/November-1)

UBV photometry and period variations of V839 Ophiuchi.

AKALIN A. and DERMAN E.

Abstract (from CDS):

A complete period variation analysis and new light curves of V 839 Oph together with new ephemeris data are presented. The period variation was found to be dP/dt=3.1x10–7d/yr. The period increment indicates that the conservative mass transfer rate from the less massive component to the more massive one is 6.5x10–7M/yr. We fitted parabolic and we discuss the possible detection of sinusoidal curves to the (O-C) diagram and sinusoidal oscillations with period of about 20yr and semi-amplitude of 0.0065 day. A simultaneous solution of the B and V light curves was computed using the Wilson-Devinney synthetic light-curve code. The light curve solution indicates that the A-type W UMa-type system is in contact with a filling factor of ∼39%.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - stars: individual: V 839 Oph

VizieR on-line data: <Available at CDS (J/A+AS/125/407): table2 table5>

Simbad objects: 9

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Number of rows : 9

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 HD 13078 EB* 02 09 03.4212577466 +40 47 39.165390795   9.41 8.98     F2Vv 122 0
2 V* TZ Boo EB* 15 08 09.1344964536 +39 58 12.864002715   10.60       G2Vn 195 0
3 HD 166048 * 18 08 33.7492265214 +09 00 49.124878168   9.56 9.22     A2 5 0
4 HD 166099 * 18 08 50.7028098789 +09 04 16.641424422   9.76 9.28     F8 6 0
5 V* V839 Oph EB* 18 09 21.2653297696 +09 09 03.605427060   9.62 9.03   8.286 F8V 134 0
6 V* VW Cep EB* 20 37 21.6248469581 +75 36 01.889162699   8.13   7.0   G8V+K0V 528 0
7 V* DK Cyg EB* 21 35 02.6694770300 +34 35 45.398785963   10.98 10.56     A6V 132 0
8 V* SW Lac EB* 22 53 41.6541327083 +37 56 18.604271966   9.65 8.51     K0Vv 354 0
9 V* AB And EB* 23 11 32.0860884375 +36 53 35.107206154   10.62 9.50     G5+G5V 255 0

    Equat.    Gal    SGal    Ecl

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