In quest of non-thermal signatures in early-type stars

Martı́, Josep; Luque-Escamilla, Pedro L.; Casares, J.; Marcote, B.; Paredes-Fortuny, X.; Ribó, M.; Paredes, J. M.; Núñez, J.

doi:10.1007/s10509-014-2157-7

Cited by 3 publications

(6 citation statements)

References 19 publications

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“…Our attention focused on 3FGL J0133.3+5930 as a continuation of our work in Martí et al (2015), which was aimed at selecting early-type stars that show indications of non-thermal signatures. The main source of optical stellar information came from the catalogues collectively know as Luminous Stars in the Northern Milky Way (LS) that was pioneered by Hardorp et al (1959).…”

Section: Target Selectionmentioning

confidence: 99%

“…The general outline of our approach has been described in Martí et al (2015), and is based on a joint cross-identification of 3FGL gamma-ray sources against different optical, X-ray and radio catalogues.…”

Section: Introductionmentioning

confidence: 99%

“…In this context, the present work builds on our previous efforts to contribute to enlarge the known population of binary systems with a significant gamma-ray component in their spectral energy distribution (SED). The general outline of our approach has been described in Martí et al (2015), and is based on a joint cross-identification of 3FGL gamma-ray sources against different optical, X-ray and radio catalogues.…”

Section: Introductionmentioning

confidence: 99%

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Peculiar objects towards 3FGL J0133.3+5930: an eclipsing Be star and an active galactic nucleus

Martı́

Luque-Escamilla

Paredes

et al. 2017

A&A

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Aims. We aim to contribute to the identification of unassociated gamma-ray sources in the galactic plane to enlarge the currently known population of gamma-ray binaries and related systems, such as radio-emitting X-ray binaries and microquasars. These objects are currently regarded as excellent test beds for the understanding of high-energy phenomena in stellar systems. Methods. Potential targets of study are selected based on cross-identification of the third Fermi Large Area Telescope catalogue with historical catalogues of luminous stars that have often been found as optical counterparts in known cases. Follow-up observations and analysis of multi-wavelength archival data are later used to seek further proofs of association beyond the simple positional agreement. Results. Current results enable us to present here the case of the Fermi source 3FGL J0133.3+5930 where two peculiar objects have been discovered inside its region of uncertainty. One of them is the star TYC 3683-985-1 (LS I +59 79) whose eclipsing binary nature is reported in this work. The other is the X-ray source Swift J0132.9+5932, which we found to be a likely low-power active galactic nucleus at z = 0.1143 ± 0.0002. If this second object is of blazar type, it could easily account for the observed gamma-ray photon flux. However, this is not confirmed at present, thus rendering the star system TYC 3683-985-1 as a still possible alternative counterpart candidate to the Fermi source.

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Section: Target Selectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Peculiar objects towards 3FGL J0133.3+5930: an eclipsing Be star and an active galactic nucleus

Martı́

Luque-Escamilla

Paredes

et al. 2017

A&A

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“…Although the gamma‐ray sky is mostly dominated by extragalactic blazar sources, other populations of stellar gamma‐ray emitters are also worth studying and searching for (Martí et al 2013). A clear clue that betrays the possible connection of a stellar object with a gamma‐ray source is the detection of non‐thermal radio emission, by means of dedicated observations or catalog cross‐identifications, implying a population of relativistic electrons (Martí et al 2015; Martí & Luque‐Escamilla 2021). If additional signs of binarity are found, then the suspicion becomes strengthened as prototypical stellar gamma‐ray sources are often binary systems (Chernyakova & Malyshev 2020).…”

Section: Introductionmentioning

confidence: 99%

Lessons from the apparent peculiar nature of the star TYC 6544‐3483‐1

Martí,

Luque‐Escamilla,

Marcote

et al. 2024

Astron Nachr

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We report a radio and optical study of the star TYC 6544‐3483‐1 originally selected as a follow‐up target in the course of our efforts to cross‐identify Galactic high‐energy sources. The star by itself finally turned out to be a very ordinary main‐sequence star despite the initial expectations that apparently pointed to the contrary. We found that its, at first glance, exotic properties arise as a combined consequence of the limited angular resolution of the radio and optical databases being used. Our preliminary astrophysical interpretation was strongly hampered by the presence of unexpected optical variables inside both the photometric and background apertures. While such an ill‐posed situation is not a frequent one, we believe that our experience is worth sharing with the community to raise a word of caution and help to avoid similar misleading results, especially when dealing with modern TESS data.

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“…Other systems with bright optical counterparts, such as LS I +61 • 303, LS 5039, or MWC 148, were also flagged as peculiar stars and included in these old catalogs decades before their gamma-ray detection. This circumstance prompted us to develop an alternative strategy to find signatures of any nonthermal phenomena in earlytype stars by cross-correlating their spectroscopic catalogs with modern multiwavelength surveys [15]. In fact, LS 5039 itself was first spotted in this way as an extraordinary nonthermal radio emitter [16] prior to its later recognition as a true gamma-ray binary [17].…”

Section: Introductionmentioning

confidence: 99%

Searching for Gamma-Ray Binaries in Multiwavelength Catalogs

Martı́

Luque-Escamilla

2021

Universe

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The number of gamma-ray binaries currently known is still so small that even a new finding represents a significant expansion of its population. We present a possible hunting strategy based on screening different catalogs to filter potential peculiar stars consistent with gamma-ray sources whose association at lower energies is not yet certain. So far, two candidate systems have emerged from this process; we report about them here.

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In quest of non-thermal signatures in early-type stars

Cited by 3 publications

References 19 publications

Peculiar objects towards 3FGL J0133.3+5930: an eclipsing Be star and an active galactic nucleus

Peculiar objects towards 3FGL J0133.3+5930: an eclipsing Be star and an active galactic nucleus

Lessons from the apparent peculiar nature of the star TYC 6544‐3483‐1

Searching for Gamma-Ray Binaries in Multiwavelength Catalogs

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