Confirmation of the Luminous Blue Variable Status of MWC 930
We present spectroscopic and photometric observations of the emission-line star MWC 930 (V446 Sct) during its long-term optical brightening in 2006–2013. Based on our earlier data we suggested that the object has features found in Luminous Blue Variables (LBV), such as a high luminosity (~3 105 L⊙),...
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Hindawi Limited
2014-01-01
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| Series: | Advances in Astronomy |
| Online Access: | http://dx.doi.org/10.1155/2014/130378 |
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doaj-7fbc83f7bf3d4b6aa357e7df6d8491342020-11-24T21:06:44ZengHindawi LimitedAdvances in Astronomy1687-79691687-79772014-01-01201410.1155/2014/130378130378Confirmation of the Luminous Blue Variable Status of MWC 930A. S. Miroshnichenko0N. Manset1S. V. Zharikov2J. Zsargó3J. A. Juárez Jiménez4J. H. Groh5H. Levato6M. Grosso7R. J. Rudy8E. A. Laag9K. B. Crawford10R. C. Puetter11D. E. Reichart12K. M. Ivarsen13J. B. Haislip14M. C. Nysewander15A. P. LaCluyze16Department of Physics and Astronomy, University of North Carolina at Greensboro, Greensboro, NC 27402, USACFHT Corporation, 65-1238 Mamalahoa Highway, Kamuela, HI 96743, USAInstituto de Astronomía, Universidad Nacional Autónoma de México, Apartado Postal 877, 22830 Ensenada, BC, MexicoDepartimento de Físika, Escuela Superior de Física y Matematicas del Instituto Politecnico Nacional, Edif. 9, U. P. Zacatenco, 07738 Cuidad de Mexico, DF, MexicoDepartimento de Físika, Escuela Superior de Física y Matematicas del Instituto Politecnico Nacional, Edif. 9, U. P. Zacatenco, 07738 Cuidad de Mexico, DF, MexicoGeneva Observatory, Geneva University, Chemin des Maillettes 51, 1290 Sauverny, SwitzerlandInstituto de Ciencias Astronómicas de la Tierra y del Espacio, CONICET, Casilla de Correo 49, 5400 San Juan, ArgentinaInstituto de Ciencias Astronómicas de la Tierra y del Espacio, CONICET, Casilla de Correo 49, 5400 San Juan, ArgentinaThe Aerospace Corporation, M2/266, P.O. Box 92957, Los Angeles, CA 90009, USAThe Aerospace Corporation, M2/266, P.O. Box 92957, Los Angeles, CA 90009, USAThe Aerospace Corporation, M2/266, P.O. Box 92957, Los Angeles, CA 90009, USACenter for Astrophysics and Space Science, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USADepartment of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599, USADepartment of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599, USADepartment of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599, USADepartment of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599, USADepartment of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599, USAWe present spectroscopic and photometric observations of the emission-line star MWC 930 (V446 Sct) during its long-term optical brightening in 2006–2013. Based on our earlier data we suggested that the object has features found in Luminous Blue Variables (LBV), such as a high luminosity (~3 105 L⊙), a low wind terminal velocity (~140 km s−1), and a tendency to show strong brightness variations (~1 mag over 20 years). For the last ~7 years it has been exhibiting a continuous optical and near-IR brightening along with a change of the emission-line spectrum appearance and cooling of the star’s photosphere. We present the object’s V-band light curve, analyze the spectral variations, and compare the observed properties with those of other recognized Galactic LBVs, such as AG Car and HR Car. Overall we conclude the MWC 930 is a bona fide Galactic LBV that is currently in the middle of an S Dor cycle.http://dx.doi.org/10.1155/2014/130378 |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
A. S. Miroshnichenko N. Manset S. V. Zharikov J. Zsargó J. A. Juárez Jiménez J. H. Groh H. Levato M. Grosso R. J. Rudy E. A. Laag K. B. Crawford R. C. Puetter D. E. Reichart K. M. Ivarsen J. B. Haislip M. C. Nysewander A. P. LaCluyze |
| spellingShingle |
A. S. Miroshnichenko N. Manset S. V. Zharikov J. Zsargó J. A. Juárez Jiménez J. H. Groh H. Levato M. Grosso R. J. Rudy E. A. Laag K. B. Crawford R. C. Puetter D. E. Reichart K. M. Ivarsen J. B. Haislip M. C. Nysewander A. P. LaCluyze Confirmation of the Luminous Blue Variable Status of MWC 930 Advances in Astronomy |
| author_facet |
A. S. Miroshnichenko N. Manset S. V. Zharikov J. Zsargó J. A. Juárez Jiménez J. H. Groh H. Levato M. Grosso R. J. Rudy E. A. Laag K. B. Crawford R. C. Puetter D. E. Reichart K. M. Ivarsen J. B. Haislip M. C. Nysewander A. P. LaCluyze |
| author_sort |
A. S. Miroshnichenko |
| title |
Confirmation of the Luminous Blue Variable Status of MWC 930 |
| title_short |
Confirmation of the Luminous Blue Variable Status of MWC 930 |
| title_full |
Confirmation of the Luminous Blue Variable Status of MWC 930 |
| title_fullStr |
Confirmation of the Luminous Blue Variable Status of MWC 930 |
| title_full_unstemmed |
Confirmation of the Luminous Blue Variable Status of MWC 930 |
| title_sort |
confirmation of the luminous blue variable status of mwc 930 |
| publisher |
Hindawi Limited |
| series |
Advances in Astronomy |
| issn |
1687-7969 1687-7977 |
| publishDate |
2014-01-01 |
| description |
We present spectroscopic and photometric observations of the emission-line star MWC 930 (V446 Sct) during its long-term optical brightening in 2006–2013. Based on our earlier data we suggested that the object has features found in Luminous Blue Variables (LBV), such as a high luminosity (~3 105 L⊙), a low wind terminal velocity (~140 km s−1), and a tendency to show strong brightness variations (~1 mag over 20 years). For the last ~7 years it has been exhibiting a continuous optical and near-IR brightening along with a change of the emission-line spectrum appearance and cooling of the star’s photosphere. We present the object’s V-band light curve, analyze the spectral variations, and compare the observed properties with those of other recognized Galactic LBVs, such as AG Car and HR Car. Overall we conclude the MWC 930 is a bona fide Galactic LBV that is currently in the middle of an S Dor cycle. |
| url |
http://dx.doi.org/10.1155/2014/130378 |
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