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Title: Search for Galactic runaway stars using Gaia Data Release 1 and HIPPARCOS proper motions
Authors: Maíz Apellániz, J.; Pantaleoni González, M.; Barbá, R. H.; Simón-Díaz, S.; Negueruela, I.; Lennon, D. J.; Sota, A.; Trigueros Páez, E.
Affiliation: Maíz Apellániz, J.: Centro de Astrobiología, CSIC-INTA, Campus ESAC, Camino Bajo del Castillo s/n, 28 692, Villanueva de la Cañada, Spain
Pantaleoni González, M.: Centro de Astrobiología, CSIC-INTA, Campus ESAC, Camino Bajo del Castillo s/n, 28 692, Villanueva de la Cañada, Spain; Departamento de Astrofísica y Física de la Atmósfera, Universidad Complutense de Madrid, 28 040, Madrid, Spain
Barbá, R. H.: Departamento de Física y Astronomía, Universidad de La Serena, Av. Cisternas 1200 Norte, La Serena, Chile
Simón-Díaz, S.: Instituto de Astrofísica de Canarias, 38 200, La Laguna,, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna, 38 205, La Laguna, Tenerife, Spain
Negueruela, I.: Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Escuela Politécnica Superior, Universidad de Alicante, Carretera San Vicente del Raspeig s/n, 03 690, San Vicente del Raspeig, Spain
Lennon, D. J.: ESA - European Space Astronomy Centre, Camino Bajo del Castillo s/n, 28 692, Villanueva de la Cañada, Spain
Sota, A.: Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n, 18 008, Granada, Spain
Trigueros Páez, E.: Centro de Astrobiología, CSIC-INTA, Campus ESAC, Camino Bajo del Castillo s/n, 28 692, Villanueva de la Cañada, Spain; Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Escuela Politécnica Superior, Universidad de Alicante, Carretera San Vicente del Raspeig s/n, 03 690, San Vicente del Raspeig, Spain
Publication: Astronomy & Astrophysics, Volume 616, id.A149, 20 pp.
Date: 08/2018
Keywords: surveys; proper motions; Galaxy: structure; supergiants; stars: kinematics and dynamics; stars: early-type; Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Astrophysics of Galaxies
DOI: 10.1051/0004-6361/201832787
ADS: 2018A&A...616A.149M  [Bibtex entry]

Abstract

Context. The first Gaia Data Release (DR1) significantly improved the previously available proper motions for the majority of the Tycho-2 stars.
Aims: We wish to detect runaway stars using Gaia DR1 proper motions and compare our results with previous searches.
Methods: Runaway O stars and BA supergiants were detected using a 2D proper motion method. The sample was selected using Simbad, spectra from our GOSSS project, literature spectral types, and photometry processed using the code CHORIZOS.
Results: We detect 76 runaway stars, 17 (possibly 19) of them with no prior identification as such, with an estimated detection rate of approximately one half of the real runaway fraction. An age effect appears to be present, with objects of spectral subtype B1 and later having traveled for longer distances than runaways of earlier subtypes. We also tentatively propose that the fraction of runaways is lower among BA supergiants that among O stars, but further studies using future Gaia data releases are needed to confirm this. The frequency of fast rotators is high among runaway O stars, which indicates that a significant fraction of them (and possibly the majority) is produced in supernova explosions.

The spectral types in Table 2 will be added to the spectral types in the three GOSSS survey papers and in <xref ref-type="bibr" rid="R63">http://Maíz Apellániz et al. (2018)</xref>http:// and the resulting table will be available from the GOSC web site http://gosc.cab.inta-csic.es.

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