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Candidate LBV stars...
Candidate LBV stars in galaxy NGC 7793 found via HST photometry plus MUSE spectroscopy
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Wofford, Aida (author)
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Ramirez, Vanesa (author)
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Lee, Janice C. (author)
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Thilker, David A. (author)
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- Della Bruna, Lorenza (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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- Adamo, Angela (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Van Dyk, Schuyler D. (author)
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Herrero, Artemio (author)
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Kim, Hwihyun (author)
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Aloisi, Alessandra (author)
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Calzetti, Daniela (author)
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Chandar, Rupali (author)
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Dale, Daniel A. (author)
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de Mink, Selma E. (author)
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Gallagher, John S. (author)
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Gouliermis, Dimitrios A. (author)
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Grasha, Kathryn (author)
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Grebel, Eva K. (author)
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Sacchi, E. (author)
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Smith, Linda J. (author)
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Ubeda, Leonardo (author)
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Walterbos, Rene A. M. (author)
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Hannon, Stephen (author)
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Messa, Matteo (author)
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(creator_code:org_t)
- 2020-02-03
- 2020
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 493:2, s. 2410-2428
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https://academic.oup...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Only about 19 Galactic and 25 extragalactic bonafide luminous blue variables (LBVs) are known to date. This incomplete census prevents our understanding of this crucial phase of massive star evolution which leads to the formation of heavy binary black holes via the classical channel. With large samples of LBVs one could better determine the duration and maximum stellar luminosity which characterize this phase. We search for candidate LBVs (cLBVs) in a new galaxy, NGC 7793. For this purpose, we combine high spatial resolution images from two Hubble Space Telescope (HST) programs with optical spectroscopy from the Multi Unit Spectroscopic Explorer (MUSE). By combining PSF-fitting photometry measured on F547M, F657N, and F814W images, with restrictions on point-like appearance (at HST resolution) and Ha luminosity, we find 100 potential cLBVs, 36 of which fall in the MUSE fields. Five of the latter 36 sources are promising cLBVs which have M-V <= -7 and a combination of: H alpha with a P-Cygni profile; no [O I]lambda 6300 emission; weak or no [O III]lambda 5007 emission; large [N II]/H alpha relative to HII regions; and [S II]lambda 6716/[S II]lambda 6731 similar to 1. It is not clear if these five cLBVs are isolated from O-type stars, which would favour the binary formation scenario of LBVs. Our study, which approximately covers one fourth of the optical disc of NGC 7793, demonstrates how by combining the above HST surveys with multi-object spectroscopy from 8-m class telescopes, one can efficiently find large samples of cLBVs in nearby galaxies.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- catalogues
- stars: massive
- stars: variables: S Doradus
- galaxies: individual: NGC 7793
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Wofford, Aida
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Ramirez, Vanesa
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Lee, Janice C.
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Thilker, David A ...
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Della Bruna, Lor ...
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Adamo, Angela
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show more...
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Van Dyk, Schuyle ...
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Herrero, Artemio
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Kim, Hwihyun
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Aloisi, Alessand ...
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Calzetti, Daniel ...
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Chandar, Rupali
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Dale, Daniel A.
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de Mink, Selma E ...
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Gallagher, John ...
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Gouliermis, Dimi ...
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Grasha, Kathryn
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Grebel, Eva K.
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Sacchi, E.
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Smith, Linda J.
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Ubeda, Leonardo
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Walterbos, Rene ...
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Hannon, Stephen
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Messa, Matteo
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Monthly notices ...
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Stockholm University