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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The macho project large magellanic cloud variable star inventory. IV. New R coronae borealis stars
Astrophysical Journal, Volume 470, No. 1 PART I, Year 1996
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Description
We report the discovery of two new R Coronae Borealis (RGB) stars in the LMC using the MACHO project photometry database. The identification of both stars has been confirmed spectroscopically. One is a cool RGB star (Teff ∼ 5000 K), characterized by very strong Swan bands of C2 and violet bands of CN, and weak or absent Bahner lines, G band, and 12C13C bands. The second star is an example of a hot RGB star, of which only three were previously known to exist in the Galaxy and none in the LMC. Its spectrum is characterized by several G n lines in emission. Both stars have shown deep declines of Δ F ≥ 4 mag in brightness. The new stars are significantly fainter at maximum light than the three previously known LMC RGB stars. The amount of reddening toward these stars is somewhat uncertain, but both seem to have absolute magnitudes, MV, ∼0.5 mag fainter than the other three stars. Estimates of Mbol find that the hot RGB star lies in the range of the other three stars, while the cool RGB star is fainter. The two cool LMC RGB stars are the faintest at Mbol. The discovery of these two new stars brings to five the number of known RGB stars in the LMC, and it demonstrates the utility of the MACHO photometric database for the discovery of new RGB stars. © 1996. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Alcock, Charles R.
United States, Livermore
Lawrence Livermore National Laboratory
Allsman, Roberta A.
United States, Berkeley
University of California, Berkeley
Alves, David R.
United States, Davis
University of California, Davis
Axelrod, Timothy S.
United States, Seattle
University of Washington
Decker, A.
United States, Baton Rouge
Louisiana State University
Bennett, David P.
Australia, Canberra
Australian National University, Mount Stromlo Observatory
Clayton, Geoffrey C.
United States, La Jolla
University of California, San Diego
Cook, Kem H.
South Africa, Cape Town
South African Astronomical Observatory
Freeman, Kenneth C.
United States, Santa Barbara
University of California, Santa Barbara
Griest, Kim
United Kingdom, Oxford
University of Oxford
Guern, J. A.
Canada, Hamilton
Mcmaster University
Kilkenny, David
United States, Livermore
Lawrence Livermore National Laboratory
Lehner, Matthew J.
United States, Berkeley
University of California, Berkeley
Marshall, Stuart L.
United States, Davis
University of California, Davis
Minniti, Dante
United States, Seattle
University of Washington
Peterson, Bruce A.
United States, Baton Rouge
Louisiana State University
Pratt, Mark R.
United States, Baton Rouge
Louisiana State University
Quinn, Peter J.
Australia, Canberra
Australian National University, Mount Stromlo Observatory
Rodgers, Alexander W.
United States, Davis
University of California, Davis
Stubbs, Christopher W.
United States, La Jolla
University of California, San Diego
Sutherland, William J.
United States, Santa Barbara
University of California, Santa Barbara
Welch, Douglas L.
United States, Berkeley
University of California, Berkeley
Statistics
Citations: 26
Authors: 22
Affiliations: 11
Identifiers
Doi:
10.1086/177890
ISSN:
0004637X
e-ISSN:
15384357
Research Areas
Environmental