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Quantitative spectroscopic analyses in the IACOB+OWN project: Massive O-type stars in the Galaxy with the current Gaia information

Holgado, Gonzalo; Simón-Díaz, Sergio; Barbá, Rodolfo
The Lives and Death-Throes of Massive Stars, Proceedings of the International Astronomical Union, IAU Symposium, Volume 329, pp. 407-407 (2017).
11/2017

ABSTRACT

We present the results from the quantitative spectroscopic analysis of ~280 likely single O stars targeted by the IACOB and OWN surveys. This implies the largest sample of Galactic O-type stars analyzed homogeneously to date. We used the iacob-broad and iacob-gbat tools (see Simón-Díaz et al. 2011,2015) to obtain the complete set of spectroscopic parameters which can be determined from the optical spectrum of O-type stars: projected rotational velocity (v sin i), macroturbulence velocity (v mac), effective temperature (Teff), gravity (logg), wind-strength (logQ), helium abundance (Y He), microturbulence (ξt), and the exponent of the wind-law (β).