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    Catching the fish - Constraining stellar parameters for TX Piscium using spectro-interferometric observations

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    Authors
    Klotz, D.
    Paladini, C.
    Hron, J.
    Aringer, B.
    Sacuto, S.
    Marigo, P.
    Verhoelst, T.
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    Discipline
    Physical sciences
    Subject
    Stars: atmosphere
    Stars: carbon
    Stars:AGB and post AGB
    Stars:fundamental parameters
    Techniques: interferometric
    Techniques: spectroscopic
    Carbon
    Interferometry
    Temperature
    Stars
    Audience
    Scientific
    Date
    2013
    Metadata
    Show full item record
    Description
    Stellar parameter determination is a challenging task when dealing with galactic giant stars. The combination of different investigation techniques has proven to be a promising approach. Aims. We analyse archive spectra obtained with the Short Wavelength Spectrometer (SWS) onboard ISO, and new interferometric observations from the Very Large Telescope MID-infrared Interferometric instrument (VLTI/MIDI) of a very well studied carbon-rich giant: TX Psc. The aim of this work is to determine stellar parameters using spectroscopy and interferometry. Methods. The observations are used to constrain the model atmosphere, and eventually the stellar evolutionary model in the region where the tracks map the beginning of the carbon star sequence. Two different approaches are used to determine stellar parameters: (i) the "classic" interferometric approach where the effective temperature is fixed by using the angular diameter in the N-band (from interferometry) and the apparent bolometric magnitude; (ii) parameters are obtained by fitting a grid of state-of-the-art hydrostatic models to spectroscopic and interferometric observations. Results. We find good agreement between the parameters of the two methods. The effective temperature and luminosity clearly place TX Psc in the carbon-rich AGB star domain in the H-R-diagram. Current evolutionary tracks suggest that TX Psc became a C-star just recently, which means that the star is still in a "quiet" phase compared to the subsequent strong-wind regime. This agrees with the C/O ratio being only slightly greater than one.
    Citation
    Klotz, D.; Paladini, C.; Hron, J.; Aringer, B.; Sacuto, S.; Marigo, P.; Verhoelst, T. (2013). Catching the fish - Constraining stellar parameters for TX Piscium using spectro-interferometric observations. , Astronomy and Astrophysics, Vol. 550, A86, DOI: 10.1051/0004-6361/201220444.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/2878
    doi: http://dx.doi.org/10.1051/0004-6361/201220444
    scopus: 2-s2.0-84875295072
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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