2017ApJ...842..110P


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.23CEST20:46:05

2017ApJ...842..110P - Astrophys. J., 842, 110-110 (2017/June-3)

Mass and p-factor of the Type II Cepheid OGLE-LMC-T2CEP-098 in a binary system.

PILECKI B., GIEREN W., SMOLEC R., PIETRZYNSKI G., THOMPSON I.B., ANDERSON R.I., BONO G., SOSZYNSKI I., KERVELLA P., NARDETTO N., TAORMINA M., STEPIEN K. and WIELGORSKI P.

Abstract (from CDS):

We present the results of a study of the type II Cepheid (Ppuls = 4.974 days) in the eclipsing binary system OGLE-LMC-T2CEP-098 (Porb = 397.2 days). The Cepheid belongs to the peculiar W Vir group, for which the evolutionary status is virtually unknown. It is the first single-lined system with a pulsating component analyzed using the method developed by Pilecki et al. We show that the presence of a pulsator makes it possible to derive accurate physical parameters of the stars even if radial velocities can be measured for only one of the components. We have used four different methods to limit and estimate the physical parameters, eventually obtaining precise results by combining pulsation theory with the spectroscopic and photometric solutions. The Cepheid radius, mass, and temperature are 25.3±0.2 R, 1.51±0.09 M, and 5300±100 K, respectively, while its companion has a similar size (26.3 R), but is more massive (6.8 M) and hotter (9500 K). Our best estimate for the p-factor of the Cepheid is 1.30±0.03. The mass, position on the period-luminosity diagram, and pulsation amplitude indicate that the pulsating component is very similar to the Anomalous Cepheids, although it has a much longer period and is redder in color. The very unusual combination of the components suggest that the system has passed through a mass-transfer phase in its evolution. More complicated internal structure would then explain its peculiarity.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): binaries: eclipsing - galaxies: individual: LMC - stars: oscillations - stars: variables: Cepheids - stars: variables: Cepheids

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5375 1
2 V* RV Tau Mi* 04 47 06.7238218181 +26 10 45.530144720   11.00 9.80     K0 261 0
3 OGLE LMC-CEP-227 cC* 04 52 15.6982549282 -70 14 31.242341027     15.317   14.438 ~ 46 0
4 OGLE LMC-SC21 40876 WV* 05 20 24.9999640591 -70 11 08.742979449     14.767 14.638 14.374 ~ 17 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14326 1
6 OGLE LMC-CEP-4506 cC* 05 53 29.3579743272 -67 53 59.360079055     15.459   14.778 ~ 15 0
7 V* RU Cam WV* 07 21 44.1178182168 +69 40 14.725818530   9.95 8.60 8.84   C0,1_CH4 139 0
8 V* W Vir WV* 13 26 01.9928122043 -03 22 43.429880244   10.33 9.46 9.29 9.393 F2Ibe 279 0
9 V* BL Her WV* 18 01 09.2241552984 +19 14 56.695123489   10.54 9.70     F0 153 0
10 * kap Pav WV* 18 56 57.0309200480 -67 14 00.566631622   5.08 4.40     G5Iab/b 116 0

    Equat.    Gal    SGal    Ecl

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2019.10.23-20:46:05

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