2008A&A...489.1213U


C.D.S. - SIMBAD4 rel 1.7 - 2020.03.30CEST13:20:20

2008A&A...489.1213U - Astronomy and Astrophysics, volume 489, 1213-1224 (2008/10-3)

The γDoradus CoRoT target HD49434. I. Results from the ground-based campaign.

UYTTERHOEVEN K., MATHIAS P., PORETTI E., RAINER M., MARTIN-RUIZ S., RODRIGUEZ E., AMADO P.J., LE CONTEL D., JANKOV S., NIEMCZURA E., POLLARD K.R., BRUNSDEN E., PAPARO M., COSTA V., VALTIER J.-C., GARRIDO R., SUAREZ J.C., KILMARTIN P.M., CHAPELLIER E., RODRIGUEZ-LOPEZ C., MARIN A.J., ACEITUNO F.J., CASANOVA V., ROLLAND A. and OLIVARES I.

Abstract (from CDS):

We present an extensive ground-based photometric and spectroscopic campaign of the γDor CoRoT target HD49434. This campaign was a preparatory step of the CoRoT satellite observations, which occurred between October 2007 and March 2008. With satellite data, detection of low-degree pulsation modes only is achievable, and, as no filters are available, with poor identification. Ground-based data promise eventually to identify additional modes and provide extra input for the identification: spectroscopic data allows the detection of high-degree modes and an estimate of the azimuthal number m. We attempt to detect and identify as many pulsation modes as possible from the ground-based dataset of the γDor star HD49434, and anticipate the CoRoT results. We searched for frequencies in the multi-colour variations, the pixel-to-pixel variations across the line profiles, and the moments variations in a large dataset, consisting of both multi-colour photometric and spectroscopic data from different observatories, using different frequency analysis methods. We performed a tentative mode identification of the spectroscopic frequencies using the Moment Method and the Intensity Period Search Method. We also completed an abundance analysis. The frequency analysis clearly indicates the presence of four frequencies in the 0.2-1.7d–1 interval, as well as six frequencies in the 5-12d–1 domain. The low frequencies are typical of γDor variables, while the high frequencies are common to δSct pulsators. We propose that the frequency 2.666d–1 is the rotational frequency. All modes, for which an identification was possible, appear to be high-degree modes (3≤l≤8). We did not find evidence for a possible binary nature of the star HD49434. The element abundances that we derived are consistent with values obtained in previous analyses. We classify the γDor star HD49434 as a hybrid pulsator, which pulsates simultaneously in p- and g-modes. This implies that HD49434 is an extremely interesting target for asteroseismic modelling.

Abstract Copyright:

Journal keyword(s): stars: oscillations - stars: individual: HD49434 - line: profiles - stars: variables: δ Sct

Status at CDS:  

Simbad objects: 16

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Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* V529 And gD* 01 27 26.6726118342 +41 06 04.183109728   6.711 6.425     A7m 69 0
2 * gam Dor gD* 04 16 01.5882311191 -51 29 11.919063290   4.55 4.20     F1V 283 0
3 HD 43913 Be* 06 18 58.4589462861 +04 11 28.732141877   7.97 7.86     B8IV/V 15 0
4 HD 44195 dS* 06 20 42.7371591892 +05 16 42.123098756   7.84 7.54     F0 23 0
5 HD 48922 * 06 45 50.0532290625 -00 42 59.247567474   6.743 6.770     B9.5IV/V 13 0
6 HD 49434 gD* 06 48 19.0657567870 -01 19 08.128922715   6.015 5.731     F0V+ 83 0
7 HD 49933 ** 06 50 49.831 -00 32 27.18           F3V 322 1
8 V* FG Vir dS* 12 14 15.4567370777 -05 42 59.750421714   6.807 6.558     A8/9V 207 0
9 V* NW Com dS* 13 12 47.4310667302 +26 52 52.189795637   8.74 8.46     ~ 39 0
10 * eps Cen bC* 13 39 53.25774 -53 27 59.0081 1.16 2.08 2.30 2.45 2.70 B1III 239 0
11 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1719 2
12 * kap Sco bC* 17 42 29.27520 -39 01 47.9391 1.32 2.211 2.386     B1.5III 227 0
13 * del Sct dS* 18 42 16.4270465894 -09 03 09.200429056   5.04 4.71     F2II-III 446 0
14 * bet Cep bC* 21 28 39.5968513 +70 33 38.574681 2.05 3.01 3.23 3.33 3.55 B0.5IIIs 681 0
15 BD+18 4914 dS* 22 02 37.6976881770 +18 54 02.636748948   11.16 10.63     F5 19 0
16 V* CK Ind gD* 22 04 38.4299738040 -64 43 42.007848070   7.57 7.32     A9/F0V-IV 78 0

    Equat.    Gal    SGal    Ecl

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2020.03.30-13:20:20

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