2010A&A...509A..77K


Query : 2010A&A...509A..77K

2010A&A...509A..77K - Astronomy and Astrophysics, volume 509, A77-77 (2010/1-1)

Oscillating red giants in the CoRoT exofield: asteroseismic mass and radius determination.

KALLINGER T., WEISS W.W., BARBAN C., BAUDIN F., CAMERON C., CARRIER F., DE RIDDER J., GOUPIL M.-J., GRUBERBAUER M., HATZES A., HEKKER S., SAMADI R. and DELEUIL M.

Abstract (from CDS):

Observations and analysis of solar-type oscillations in red-giant stars is an emerging aspect of asteroseismic analysis with a number of open questions yet to be explored. Although stochastic oscillations have previously been detected in red giants from both radial velocity and photometric measurements, those data were either too short or had sampling that was not complete enough to perform a detailed data analysis of the variability. The quality and quantity of photometric data as provided by the CoRoT satellite is necessary to provide a breakthrough in observing p-mode oscillations in red giants. We have analyzed continuous photometric time-series of about 11400 relatively faint stars obtained in the exofield of CoRoT during the first 150 days long-run campaign from May to October 2007. We find several hundred stars showing a clear power excess in a frequency and amplitude range expected for red-giant pulsators. In this paper we present first results on a sub-sample of these stars. Knowing reliable fundamental parameters like mass and radius is essential for detailed asteroseismic studies of red-giant stars. As the CoRoT exofield targets are relatively faint (11-16 mag) there are no (or only weak) constraints on the stars' location in the H-R diagram. We therefore aim to extract information about such fundamental parameters solely from the available time series. We model the convective background noise and the power excess hump due to pulsation with a global model fit and deduce reliable estimates for the stellar mass and radius from scaling relations for the frequency of maximum oscillation power and the characteristic frequency separation. We provide a simple method to estimate stellar masses and radii for stars exhibiting solar-type oscillations. Our method is tested on a number of known solar-type pulsators.

Abstract Copyright:

Journal keyword(s): stars: oscillations - stars: fundamental parameters - techniques: photometric

Simbad objects: 45

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Number of rows : 45
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 * bet Hyi PM* 00 25 45.07036 -77 15 15.2860 3.52 3.41 2.79 2.28 1.94 G0V 594 0
2 HD 49933 PM* 06 50 49.8309774552 -00 32 27.167495244   6.147 5.771 7.04   F3V 379 2
3 NGC 2682 OpC 08 51 23.0 +11 48 50           ~ 2342 0
4 NGC 2682 193 RG* 08 51 35.7789056016 +11 53 34.748492712 13.904 13.22 12.267   11.228 K0III 106 0
5 * ksi Hya ** 11 33 00.1149306166 -31 51 27.447975478 5.17 4.47 3.54 2.84 2.36 G7IIIb 257 0
6 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2322 1
7 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 1025 2
8 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1280 1
9 * eps Oph PM* 16 18 19.2902245358 -04 41 33.047349888 4.95 4.21 3.23 2.54 2.05 G9.5IIIbFe-0.5 235 0
10 * zet Her SB* 16 41 17.16104 +31 36 09.7873 3.640 3.430 2.800 2.31 1.99 G0IV 546 0
11 * bet Oph PM* 17 43 28.3519097803 +04 34 02.293206489 5.150 3.930 2.750 1.96 1.38 K2IIICN0.5 477 0
12 * mu. Ara PM* 17 44 08.7031414872 -51 50 02.591603160   5.85 5.15     G3IV-V 533 2
13 HD 181907 RG* 19 22 21.5480809056 -00 15 08.508393504   6.906 5.811     K1III 62 0
14 2MASS J19224577+0131126 RG* 19 22 45.7703465928 +01 31 12.605659356   14.270 12.700 12.040 11.191 ~ 10 0
15 2MASS J19241108+0138078 RG* 19 24 11.0890433760 +01 38 07.791743544     13.858     ~ 7 0
16 2MASS J19245182+0129416 RG* 19 24 51.8232269304 +01 29 41.564063688     12.758     ~ 2 0
17 2MASS J19245704+0130376 RG* 19 24 57.0474928776 +01 30 37.593144612     14.133     ~ 3 0
18 UCAC2 32262656 RG* 19 25 07.1003520960 +01 06 04.520315520   15.012 13.571 12.965 12.066 ~ 14 0
19 2MASS J19251396+0034026 RG* 19 25 13.9688187216 +00 34 02.541259848     13.949     ~ 4 0
20 2MASS J19253501+0022085 RG* 19 25 35.0127634608 +00 22 08.607896904   15.179 13.744 13.193 12.349 ~ 15 0
21 2MASS J19254285-0012038 RG* 19 25 42.8549366424 -00 12 03.712224456   15.281 13.704 13.017 12.232 ~ 10 0
22 UCAC2 32263054 Pe* 19 25 55.6073329560 +01 22 55.329445956           ~ 1 0
23 2MASS J19255782+0056022 RG* 19 25 57.8255823648 +00 56 02.253478416   14.985 13.500 12.849 12.046 ~ 14 0
24 UCAC2 32434359 RG* 19 26 00.9641602920 +01 31 37.834984776   14.907 13.507 12.984 12.048 ~ 15 0
25 2MASS J19260224-0019015 RG* 19 26 02.2352801160 -00 19 01.647437232   13.9 12.996 12.0   ~ 3 0
26 2MASS J19260841+0151442 RG* 19 26 08.4190382712 +01 51 44.224985628   14.147 12.613 12.014 11.001 ~ 9 0
27 2MASS J19261943-0032595 RG* 19 26 19.4337351480 -00 32 59.528511528   14.024 12.731 12.227 11.525 ~ 13 0
28 CoRoT 101113062 RG* 19 26 31.3525103256 -00 02 14.772653232   12.899 13.462 12.899 12.136 ~ 9 0
29 2MASS J19264008+0127108 RG* 19 26 40.0917952032 +01 27 10.800099360   14.181 12.611 12.001 11.049 ~ 12 0
30 2MASS J19264557+0051573 RG* 19 26 45.5667830040 +00 51 57.297426156     14.108     ~ 5 0
31 2MASS J19270316-0032250 RG* 19 27 03.1686662640 -00 32 24.950115744     13.351   11.85 ~ 5 0
32 2MASS J19271113+0152095 RG* 19 27 11.1339978432 +01 52 09.554129256     13.462     ~ 2 0
33 CoRoT 101232297 RG* 19 27 16.2127580568 -00 15 39.554368740     12.476   11.16 ~ 8 0
34 2MASS J19271998+0045148 RG* 19 27 19.9904389944 +00 45 14.856418584     13.097     ~ 4 0
35 2MASS J19272346+0119408 RG* 19 27 23.4651349584 +01 19 40.777721616     13.721     ~ 7 0
36 2MASS J19272783+0100075 RG* 19 27 27.8358812880 +01 00 07.484634468     14.156     ~ 4 0
37 2MASS J19273800+0112570 RG* 19 27 38.0067055944 +01 12 56.956307292   14.698 13.204 12.510 11.686 ~ 10 0
38 2MASS J19281037+0049531 RG* 19 28 10.3770649848 +00 49 53.083849548   15.347 13.898 13.333 12.495 ~ 11 0
39 2MASS J19281895+0105256 RG* 19 28 18.9510306216 +01 05 25.626482916   12.135 12.755 12.135 11.235 ~ 12 0
40 UCAC2 31757514 Pe* 19 28 48.2382864936 -00 07 43.198814028         10.93 ~ 1 0
41 2MASS J19291255-0011005 RG* 19 29 12.5528198472 -00 11 00.519224928   14.444 13.056 12.422 11.695 ~ 9 0
42 2MASS J19291426+0009508 RG* 19 29 14.2592854920 +00 09 50.865553296     14.316     ~ 4 0
43 2MASS J19301425-0007224 RG* 19 30 14.2477187808 -00 07 22.466875548     12.461     ~ 5 0
44 2MASS J19301756-0014319 RG* 19 30 17.5632451536 -00 14 31.902354600     13.586   12.14 ~ 2 0
45 * nu. Ind ** 22 24 36.8853892493 -72 15 19.488237466   5.94 5.29     G9VFe-3.1CH-1.5 277 0

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