2007A&A...465..965A


Query : 2007A&A...465..965A

2007A&A...465..965A - Astronomy and Astrophysics, volume 465, 965-979 (2007/4-3)

Oscillating blue stragglers, γ Doradus stars and eclipsing binaries in the open cluster NGC 2506.

ARENTOFT T., DE RIDDER J., GRUNDAHL F., GLOWIENKA L., WAELKENS C., DUPRET M.-A., GRIGAHCENE A., LEFEVER K., JENSEN H.R., REYNIERS M., FRANDSEN S. and KJELDSEN H.

Abstract (from CDS):

This is the first step in a project to combine studies of eclipsing binaries and oscillating stars to probe the interior of Blue Stragglers (BS). This may imply a way to discriminate observationally between different birth mechanisms of BS stars. We study the open cluster NGC 2506 which contains oscillating BS stars and detached eclipsing binaries for which accurate parameters can be derived. This will tightly constrain the cluster isochrone and provide an absolute mass, radius and luminosity-scale for the cluster stars along with the cluster age, metallicity and distance. The present work focuses on obtaining the light curves of the binaries and determine their orbital periods, on obtaining power spectra of the oscillating BS stars to select targets for follow-up studies, and on searching for γ Doradus type variables which are also expected to be present in the cluster. With a two-colour, dual-site photometric campaign we obtained 3120 CCD-images of NGC 2506 spread over four months. We analysed the BI time-series of the oscillating stars and used simulations to derive statistical uncertainties of the resulting frequencies, amplitudes and phases. A preliminary mode-identification was performed using frequency ratios for the oscillating BS stars, and amplitude ratios and phase differences for a population of newly detected γ Doradus stars. We quadrupled the number of known variables in NGC 2506 by discovering 3 new oscillating BS stars, 15 γ Doradus stars and four new eclipsing binaries. The orbital periods of 2 known, detached eclipsing binaries were derived. We discovered a BS star with both p-mode and g-mode variability and we confronted our γ Doradus observations with state-of-the-art seismic models, but found significant discrepancy between theory and observations. NGC 2506 is an excellent target for asteroseismic tests of stellar models, as strong external constraints can be imposed on the models of a population of more than 20 oscillating stars of different types.

Abstract Copyright:

Journal keyword(s): stars: blue stragglers - stars: variables: delta Sct, γ Dor - stars: binaries: eclipsing - galaxies: open clusters and associations: individual: NGC 2506 - techniques: photometric

VizieR on-line data: <Available at CDS (J/A+A/465/965): stars.dat table1.dat table2.dat table3.dat table4.dat>

Nomenclature: Table 3 = stars.dat: Cl* NGC 2506 ADG VNN (Nos V1-V28).

Simbad objects: 35

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Number of rows : 35
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3747 0
2 V* V529 And gD* 01 27 26.6728869648 +41 06 04.177819368   6.711 6.425     A7m 76 0
3 * 9 Aur gD* 05 06 40.6306032888 +51 35 51.798998724       4.8   F2V 184 0
4 NGC 1817 OpC 05 12 33 +16 41.8           ~ 164 0
5 Cl* NGC 2506 ADG V19 gD* 07 59 49.6877603952 -10 46 35.458801644     15.050     ~ 5 0
6 Cl* NGC 2506 ADG V28 EB* 07 59 53.2 -10 53 26     18.60     ~ 1 0
7 Cl* NGC 2506 ADG V7 * 07 59 53.4314383752 -10 47 12.460484184     14.694     ~ 5 0
8 V* V845 Mon dS* 07 59 53.6374707360 -10 45 48.049416288   14.79 14.510     ~ 10 0
9 NGC 2506 3255 RB? 07 59 54.8623234128 -10 46 45.534870696   13.92 13.079     ~ 9 0
10 Cl* NGC 2506 ADG V14 gD* 07 59 55.7565663960 -10 48 41.530561812     15.376     ~ 5 0
11 Cl* NGC 2506 ADG V15 gD* 07 59 56.5432687584 -10 47 03.173858052     14.983     ~ 5 0
12 Cl* NGC 2506 ADG V23 gD* 07 59 57.6810648120 -10 42 54.506858076     15.246     ~ 5 0
13 Cl* NGC 2506 ADG V16 gD* 07 59 57.7036463928 -10 46 09.298104528     15.333     ~ 6 0
14 V* V846 Mon dS* 07 59 57.8587591752 -10 47 20.427925812   15.39 14.727     ~ 11 0
15 V* V847 Mon dS* 07 59 58.0995671928 -10 45 54.024951276   13.90 13.660     ~ 9 0
16 Cl* NGC 2506 ADG V20 gD* 08 00 00.8324151960 -10 43 46.910872452     15.138     ~ 4 0
17 Cl* NGC 2506 ADG V18 gD* 08 00 01.0212997536 -10 45 06.125913108     15.517     ~ 5 0
18 Cl* NGC 2506 ADG V21 gD* 08 00 01.6140015624 -10 43 26.485911984     15.424     ~ 2 0
19 NGC 2506 OpC 08 00 02 -10 46.4   8.28 7.6     ~ 249 0
20 Cl* NGC 2506 ADG V11 gD* 08 00 04.6511663904 -10 48 42.531974064     15.454     ~ 5 0
21 Cl* NGC 2506 ADG V13 gD* 08 00 04.6721633904 -10 46 39.080864280     15.599     ~ 5 0
22 Cl* NGC 2506 ADG V12 gD* 08 00 05.0277909648 -10 47 10.893541956     15.508     ~ 4 0
23 Cl* NGC 2506 ADG V25 gD* 08 00 05.2695694968 -10 51 28.898161200     15.231     ~ 5 0
24 Cl* NGC 2506 ADG V9 EB* 08 00 05.3753762856 -10 43 38.854255368     15.289     ~ 5 0
25 Cl* NGC 2506 ADG V17 gD* 08 00 07.4327801328 -10 43 33.098826360     15.521     ~ 5 0
26 V* V943 Mon EB* 08 00 08.2372846368 -10 45 49.681650600     14.645     ~ 6 0
27 Cl* NGC 2506 ADG V5 EB* 08 00 10.3189341600 -10 43 17.120634564     17.430     ~ 2 0
28 Cl* NGC 2506 ADG V22 gD* 08 00 10.3647414192 -10 40 41.957923476     15.10     ~ 5 0
29 Cl* NGC 2506 ADG V24 gD* 08 00 13.3068563424 -10 49 48.632370204     15.299     ~ 5 0
30 Cl* NGC 2506 ADG V6 * 08 00 17.2300689696 -10 45 35.183334168     14.677     ~ 5 0
31 Cl* NGC 2506 ADG V26 EB* 08 00 26.4471968664 -10 48 38.581956612     13.058     ~ 2 0
32 Cl* NGC 2506 ADG V27 EB* 08 00 28.1530008960 -10 47 12.754797936     17.175     ~ 1 0
33 Cl* NGC 2506 ADG V8 * 08 00 34.5531225744 -10 46 49.388958408     13.80     ~ 2 0
34 V* FG Vir dS* 12 14 15.4565381808 -05 42 59.750820036   6.807 6.558     A8/9V 211 0
35 BD+18 4914 dS* 22 02 37.6965551808 +18 54 02.626783740   11.16 10.63     F5 20 0

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2022.09.24-18:21:55

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