2018ApJ...862...43P


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.22CEST10:09:39

2018ApJ...862...43P - Astrophys. J., 862, 43-43 (2018/July-3)

The Araucaria project: high-precision Cepheid astrophysics from the analysis of variables in double-lined eclipsing binaries.

PILECKI B., GIEREN W., PIETRZYNSKI G., THOMPSON I.B., SMOLEC R., GRACZYK D., TAORMINA M., UDALSKI A., STORM J., NARDETTO N., GALLENNE A., KERVELLA P., SOSZYNSKI I., GORSKI M., WIELGORSKI P., SUCHOMSKA K., KARCZMAREK P. and ZGIRSKI B.

Abstract (from CDS):

Based on new observations and improved modeling techniques, we have reanalyzed seven Cepheids in the Large Magellanic Cloud. Improved physical parameters have been determined for the exotic system OGLE LMC-CEP-1718 composed of two first-overtone Cepheids and a completely new model was obtained for the OGLE LMC-CEP-1812 classical Cepheid. This is now the shortest period Cepheid for which the projection factor is measured. The typical accuracy of our dynamical masses and radii determinations is 1%. The radii of the six classical Cepheids follow period-radius relations in the literature. Our very accurate physical parameter measurements allow us to calculate a purely empirical, tight period-mass-radius relation that agrees well with theoretical relations derived from non-canonical models. This empirical relation is a powerful tool to calculate accurate masses for single Cepheids for which precise radii can be obtained from Baade-Wesselink-type analyses. The mass of the type-II Cepheid κ Pav, 0.56 ± 0.08 M, determined using this relation is in a very good agreement with theoretical predictions. We find large differences between the p-factor values derived for the Cepheids in our sample. Evidence is presented that a simple period-p-factor relation shows an intrinsic dispersion, hinting at the relevance of other parameters, such as the masses, radii, and radial velocity variation amplitudes. We also find evidence that the systematic blueshift exhibited by Cepheids is primarily correlated with their gravity. The companion star of the Cepheid in the OGLE LMC-CEP-4506 system has a very similar temperature and luminosity, and is clearly located inside the Cepheid instability strip, yet it is not pulsating.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

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

Simbad objects: 20

goto Full paper

goto View the reference in ADS

Number of rows : 20

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 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5984 1
2 OGLE LMC-CEP-227 cC* 04 52 15.6982549282 -70 14 31.242341027     15.317   14.438 ~ 49 0
3 OGLE LMC-SC21 40876 WV* 05 20 24.9999640591 -70 11 08.742979449     14.767 14.638 14.374 ~ 18 0
4 OGLE LMC-SC6 330185 cC* 05 21 54.92 -69 21 50.1   15.706 15.190   14.511 ~ 19 0
5 SV* HV 12024 cC* 05 23 07.71 -69 33 49.9   17.360 16.707   16.054 ~ 25 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15433 1
7 * bet Dor cC* 05 33 37.5125319201 -62 29 23.323100433 5.13 4.58 3.76 3.55 3.12 F8/G0Ib 354 0
8 OGLE LMC-CEP-2532 cC* 05 36 04.4845280841 -70 01 55.501166106     16.88 16.23 15.743 F4II+K1III-II 22 0
9 OGLE LMC-CEP-4506 cC* 05 53 29.3579743272 -67 53 59.360079055     15.459   14.778 ~ 16 0
10 * 48 Aur cC* 06 28 34.0875086 +30 29 34.914168 6.73 6.23 5.55   4.777 F5.5-G0Ib 367 0
11 * zet Gem cC* 07 04 06.5307903 +20 34 13.073871 5.20 4.58 3.79   3.082 G1Ib 542 0
12 V* RS Pup cC* 08 13 04.2157137938 -34 34 42.691837063 8.89 8.00 6.70   5.453 F8Iab 326 0
13 * l Car cC* 09 45 14.8112246 -62 30 28.451894   4.33 3.40     G5Iab/b 297 1
14 V* X Sgr cC* 17 47 33.6241002643 -27 49 50.848981593 5.84 5.34 4.54 6.03 3.661 F7II 316 0
15 * gam01 Sgr cC* 18 05 01.2265190154 -29 34 48.303215344 5.99 5.47 4.69   3.869 G0Ib/II 332 0
16 V* Y Sgr cC* 18 21 22.9864295 -18 51 36.001763 7.31 6.69 5.75   4.810 F8II 275 0
17 * kap Pav WV* 18 56 57.0309200480 -67 14 00.566631622   5.08 4.40     G5Iab/b 123 0
18 V* FF Aql cC* 18 58 14.7482217777 +17 21 39.295590199 6.61 6.18 5.38     F6Ib 347 0
19 V* T Vul cC* 20 51 28.2382502598 +28 15 01.816605372 6.89 6.49 5.77   5.061 F5Ib+A0.8V 325 0
20 NAME Local Group GrG ~ ~           ~ 7297 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2018ApJ...862...43P and select 'bookmark this link' or equivalent in the popup menu


2021.06.22-10:09:39

© Université de Strasbourg/CNRS

    • Contact