Fundamental parameters of two O9-type giant stars: the (former) spectral classification standard HD 93249 A and ALS 12502 A

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dc.contributor.authorAnsín, T.
dc.contributor.authorGamen, R.
dc.contributor.authorMorrell, N.
dc.contributor.authorBarbá, R. H.
dc.contributor.authorApellániz, J. M.
dc.contributor.authorArias, J.
dc.contributor.authorSimón-Díaz, S.
dc.contributor.authorHolgado, G.
dc.date.accessioned2024-05-23T18:58:34Z
dc.date.available2024-05-23T18:58:34Z
dc.date.issued2023-09-07
dc.description.abstractThe evolution of massive stars is not completely understood. Several phenomena affect their birth, life, and death, multiplicity being one of them. In this context, the OWN and MONOS projects are systematically observing O- and WN-type stars whose multiplicity status is unknown. Their major goal considers the necessity of determining absolute parameters of massive stars. We have collected spectra of HD 93249 A and ALS 12502 A aiming at characterizing their binary nature. For both stars, we analysed high-resolution spectra and combined them with Transiting Exoplanet Survey Satellite (TESS) observations to be compared with binary models constructed by means of the phoebe code. We discovered that the radial velocity of HD 93249 A varies with a period of 2.97968 +/- 0.00001 d and that the system presents ellipsoidal light variations. We disentangled the composite spectra and classified its components as O9 III and B1.5 III, respectively. Confirmed as a spectroscopic binary, HD 93249 A can no longer be used as spectral classification standard. ALS 12502 A turned out to be a detached eclipsing binary in the TESS and Gaia data. These results enable us to determine absolute parameters for each component in the system.
dc.identifier.citationAnsín, T., Gamen, R., Morrell, N., Barbá, R. H., Apellániz, J. M., Arias, J., . . . Holgado, G. (2023). Fundamental parameters of two O9-type giant stars: the (former) spectral classification standard HD 93249 A and ALS 12502 A. Monthly Notices of the Royal Astronomical Society, 525(3), 4566-4580. https://doi.org/10.1093/mnras/stad2501
dc.identifier.issn0035-8711
dc.identifier.other1365-2966
dc.identifier.urihttps://conocimientoabierto.online/handle/123456789/30
dc.language.isoen
dc.publisherMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
dc.subjectbinaries: spectroscopic
dc.subjectstars: early-type
dc.subjectstars: fundamental parameters
dc.subjectstars: individual: (HD 93249 A)
dc.subject(ALS 12502 A)
dc.titleFundamental parameters of two O9-type giant stars: the (former) spectral classification standard HD 93249 A and ALS 12502 A
dc.typeArticle

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