The nature of the hyper-runaway candidate HIP60350

Irrgang A, Przybilla N, Heber U, Nieva MF, Schuh S (2010)

Publication Type: Journal article

Publication year: 2010

Journal

Astrophysical Journal American Astronomical Society

Book Volume: 711

Pages Range: 138-143

Journal Issue: 1

DOI: 10.1088/0004-637X/711/1/138

Abstract

Young, massive stars in the Galactic halo are widely supposed to be the result of an ejection event from the Galactic disk forcing some stars to leave their place of birth as so-called runaway stars. Here, we present a detailed spectroscopic and kinematic analysis of the runaway B star HIP 60350 to determine which runaway scenario - a supernova explosion disrupting a binary system or dynamical interaction in star clusters - may be responsible for HIP 60350's peculiar orbit. Based on a non-local thermodynamic equilibrium approach, a high-resolution optical echelle spectrum was examined to revise spectroscopic quantities and for the first time to perform a differential chemical abundance analysis with respect to the B-type star 18 Peg. The results together with proper motions from the Hipparcos Catalog further allowed the three-dimensional kinematics of the star to be studied numerically. The abundances derived for HIP 60350 are consistent with a slightly supersolar metallicity agreeing with the kinematically predicted place of birth ∼6 kpc away from the Galactic center. However, they do not exclude the possibility of an α-enhanced abundance pattern expected in the case of the supernova scenario. Its outstanding high Galactic rest-frame velocity of 530 ± 35 km s-1 is a consequence of ejection in the direction of Galactic rotation and slightly exceeds the local Galactic escape velocity in a standard Galactic potential. Hence, HIP 60350 may be unbound to the Galaxy. © 2010. The American Astronomical Society.

Authors with CRIS profile

Andreas Irrgang Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Norbert Przybilla Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Ulrich Heber Naturwissenschaftliche Fakultät

Involved external institutions

Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. (MPG) / Max Planck Society for the Advancement of Science DE Germany (DE) Georg-August-Universität Göttingen DE Germany (DE)

How to cite

APA:

Irrgang, A., Przybilla, N., Heber, U., Nieva, M.F., & Schuh, S. (2010). The nature of the hyper-runaway candidate HIP60350. Astrophysical Journal, 711(1), 138-143. https://doi.org/10.1088/0004-637X/711/1/138

MLA:

Irrgang, Andreas, et al. "The nature of the hyper-runaway candidate HIP60350." Astrophysical Journal 711.1 (2010): 138-143.

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