edu.ucar.opensky::articles:10412 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T14:35:05.233217 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d74q7vgw The solar-like CoRoT target HD 170987: Spectroscopic and seismic observations 2010-09-02T00:00:00Z publication https://n2t.org/ark:/85065/d74q7vgw https://doi.org/10.1051/0004-6361/201014103 Mathur, Savita author Garcia, R. author Catala, C. author Bruntt, H. author Mosser, B. author Appourchaux, T. author Ballot, J. author Creevey, O. author Gaulme, P. author Hekker, S. author Huber, D. author Karoff, C. author Piau, L. author Regulo, C. author Roxburgh, I. author Salabert, D. author Verner, G. author Auvergne, M. author Baglin, A. author Chaplin, W. author Elsworth, Y. author Michel, E. author Samadi, R. author Sato, K. author Stello, D. author UCAR/NCAR - Library publisher Context. The CoRoT mission is in its third year of observation and the data from the second long run in the galactic centre direction are being analysed. The solar-like oscillating stars that have been observed up to now have given some interesting results, specially concerning the amplitudes that are lower than predicted. We present here the results from the analysis of the star HD 170987. Aims: The goal of this research work is to characterise the global parameters of HD 170987. We look for global seismic parameters such as the mean large separation, maximum amplitude of the modes, and surface rotation because the signal-to-noise ratio in the observations does not allow us to measure individual modes. We also aim to retrieve the parameters of the star and its chemical composition. Methods: We studied the chemical composition of the star through ground-based observations performed with the NARVAL spectrograph. We used several methods to calculate the global parameters from the acoustic oscillations based on CoRoT data. The light curve of the star has been interpolated with inpainting algorithms to reduce the effect of data gaps. Results: We found the power excess related to p modes in the range [400-1200] μHz with a mean large separation of 55.2 ± 0.8 μHz with a probability above 95 % that increases to 55.9 ± 0.2 μHz in a higher frequency range [500-1250] μHz and a rejection level of 1%. A hint of the variation of this quantity with frequency was also found. The rotation period of the star is estimated to be around 4.3 days with an inclination axis of i = 50° +20-13. We measured a bolometric amplitude per radial mode in a range [2.4-2.9] ppm around 1000 μHz. Finally we estimate the stellar mass with a grid of models, M = 1.43 ± 0.05 M_ȯ, the radius, R = 1.96 ± 0.046 R_ȯ, and the age ~2.4 Gyr. The CoRoT space mission, launched on 2006 December 27, has been developed and is operated by CNES, with the contribution of Austria, Belgium, Brazil, ESA (RSSD and Science Programme), Germany and Spain. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2010 European Southern Observatory. None eng geoscientificInformation