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- Title
In quest of non-thermal signatures in early-type stars.
- Authors
Martí, Josep; Luque-Escamilla, Pedro; Casares, Jorge; Marcote, Benito; Paredes-Fortuny, Xavier; Ribó, Marc; Paredes, Josep; Núñez, Jorge
- Abstract
A reduced fraction of luminous, early-type stars in binaries has provided some of the most interesting sources in modern high-energy astrophysics. A fingerprint of the capability of these systems to accelerate particles up to TeV energies is the associated detection of non-thermal, synchrotron emission often in the radio domain. Here we aim to identify new early-type, luminous stars where energetic, non-thermal processes are at work to enable future comparative studies based on an extended sample. Moreover, these objects also appear as very interesting targets for future gamma-ray observatories such as the Cherenkov Telescope Array. We have designed a methodology to search for new examples of these interesting sources in order to enlarge the extremely reduced population currently known. Our search procedure is described in this paper, together with a practical application using public databases and catalogues currently available (Luminous Stars in the Northern Milky Way, NRAO VLA Sky Survey, and Westerbork Northern Sky Survey). Optical and radio interferometric follow-up observations of selected candidate stars were conducted to better assess their properties. Although no new discoveries of this kind have been achieved yet, the observational data analyzed in this work does provide some interesting side results, such as characterizing the spectroscopic and photometric properties of two early-type stars originally selected as candidates to be explored, namely TYC4051-1277-1 and TYC3594-2269-1. Unexpectedly, this last one was also found to be a new DAO-type white dwarf star instead of a non-degenerate star. In addition, both stars seem to display different optical periods based on our photometric monitoring.
- Subjects
EARLY stars; STELLAR mass; GAMMA rays; ASTRONOMICAL photometry; SYNCHROTRON radiation
- Publication
Astrophysics & Space Science, 2015, Vol 356, Issue 2, p277
- ISSN
0004-640X
- Publication type
Article
- DOI
10.1007/s10509-014-2157-7