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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Discovery of two new Galactic candidate luminous blue variables with Wide-field Infrared Survey Explorer
Monthly Notices of the Royal Astronomical Society, Volume 421, No. 4, Year 2012
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Description
We report the discovery of two new Galactic candidate luminous blue variable (LBV) stars via detection of circular shells (typical of confirmed and candidate LBVs) and follow-up spectroscopy of their central stars. The shells were detected at 22μm in the archival data of the Mid-Infrared All Sky Survey carried out with the Wide-field Infrared Survey Explorer (WISE). Follow-up optical spectroscopy of the central stars of the shells conducted with the renewed Southern African Large Telescope (SALT) showed that their spectra are very similar to those of the well-known LBVs P Cygni and AG Car, and the recently discovered candidate LBV MN112, which implies the LBV classification for these stars as well. The LBV classification of both stars is supported by detection of their significant photometric variability: one of them brightened in the R and I bands by 0.68 ± 0.10 and 0.61 ± 0.04mag, respectively, during the last 13-18 years, while the second one (known as Hen 3-1383) varies its B,V,R,I and K s brightnesses by ≃0.5-0.9mag on time-scales from 10d to decades. We also found significant changes in the spectrum of Hen 3-1383 on a time-scale of ≃3 months, which provides additional support for the LBV classification of this star. Further spectrophotometric monitoring of both stars is required to firmly prove their LBV status. We discuss a connection between the location of massive stars in the field and their fast rotation, and suggest that the LBV activity of the newly discovered candidate LBVs might be directly related to their possible runaway status. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.
Authors & Co-Authors
Gvaramadze, V. V.
Russian Federation, Moscow
Lomonosov Moscow State University
Russian Federation, Moscow
Isaac Newton Institute of Chile
Kniazev, Alexei Yu
Russian Federation, Moscow
Lomonosov Moscow State University
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope Foundation
Miroshnichenko, Anatoly S.
United States, Greensboro
The University of North Carolina at Greensboro
Berdnikov, Leonid N.
Russian Federation, Moscow
Lomonosov Moscow State University
Russian Federation, Moscow
Isaac Newton Institute of Chile
Langer, Norbert
Germany, Bonn
Universität Bonn
Stringfellow, Guy S.
United States, Boulder
University of Colorado Boulder
Todt, Helge
Germany, Potsdam
Universität Potsdam
Hamann, Wolf Rainer
Germany, Potsdam
Universität Potsdam
Grebel, Eva K.
Germany, Heidelberg
Astronomisches Rechen-institut
Buckley, David A.H.
South Africa, Cape Town
Southern African Large Telescope Foundation
Crause, Lisa A.
South Africa, Cape Town
South African Astronomical Observatory
Crawford, Steven M.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope Foundation
Sickafoose, A. A.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope Foundation
Hettlage, Christian
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope Foundation
Hooper, Eric J.
United States, Madison
University of Wisconsin-madison
Husser, Tim Oliver
Germany, Gottingen
Georg-august-universität Göttingen
Kotzé, Paul P.A.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope Foundation
Loaring, Nicola S.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope Foundation
Nordsieck, Kenneth H.
United States, Madison
University of Wisconsin-madison
O'Donoghue, Darragh E.
South Africa, Cape Town
Southern African Large Telescope Foundation
Pickering, Timothy E.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope Foundation
Potter, Stephen B.
South Africa, Cape Town
South African Astronomical Observatory
Romero-Colmenero, Encarnacion
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope Foundation
Väisänen, Petri S.M.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope Foundation
Williams, Theodore B.
United States, New Brunswick
Rutgers University–new Brunswick
Wolf, Marsha J.
United States, Madison
University of Wisconsin-madison
Reichart, Daniel E.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
Ivarsen, Kevin M.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
Haislip, Joshua B.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
Nysewander, Melissa C.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
LaCluyzé, Aaron P.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
Statistics
Citations: 31
Authors: 31
Affiliations: 13
Identifiers
Doi:
10.1111/j.1365-2966.2012.20556.x
ISSN:
00358711
e-ISSN:
13652966
Study Design
Cross Sectional Study
Cohort Study
Study Approach
Quantitative