Discovery of two rare rigidly rotating magnetosphere stars in the apogee survey

Stephen S. Eikenberry, S. Drew Chojnowski, John Wisniewski, Steven R. Majewski, Matthew Shetrone, David G. Whelan, Dmitry Bizyaev, H. Jacob Borish, James R.A. Davenport, Garrett Ebelke, Diane Feuillet, Peter M. Frinchaboy, Alan Garner, Fred Hearty, Jon Holtzman, Zhi Yun Li, Sz Mészáros, David L. Nidever, Donald P. Schneider, Michael SkrutskieJohn C. Wilson, Gail Zasowski

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The Apache Point Observatory Galactic Evolution Experiment (APOGEE) - one of the Sloan Digital Sky Survey III programs - is using near-infrared (NIR) spectra of ∼100,000 red giant branch star candidates to study the structure of the Milky Way. In the course of the survey, APOGEE also acquires spectra of hot field stars to serve as telluric calibrators for the primary science targets. We report the serendipitous discovery of two rare, fast-rotating B-stars of the σ Ori E type among those blue field stars observed during the first year of APOGEE operations. Both of the discovered stars display the spectroscopic signatures of rigidly rotating magnetospheres (RRM) common to this class of highly magnetized (B ∼ 10 kGauss) stars, increasing the number of known RRM stars by ∼10%. One (HD 345439) is a main-sequence B-star with unusually strong He absorption (similar to σ Ori E), while the other (HD 23478) fits a "He-normal" B3IV classification. We combine the APOGEE discovery spectra with other optical and NIR spectra of these two stars, and of σ Ori E itself, to show how NIR spectroscopy can be a uniquely powerful tool for discovering more of these rare objects, which may show little/no RRM signatures in their optical spectra. We discuss the potential for further discovery of σ Ori E type stars, as well as the implications of our discoveries for the population of these objects and insights into their origin and evolution.

Original languageEnglish (US)
Article numberL30
JournalAstrophysical Journal Letters
Volume784
Issue number2
DOIs
StatePublished - Apr 1 2014

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magnetospheres
magnetosphere
galactic evolution
stars
observatory
observatories
near infrared
B stars
star distribution
experiment
optical spectrum
infrared spectra
signatures
infrared spectroscopy
main sequence stars

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Eikenberry, S. S., Chojnowski, S. D., Wisniewski, J., Majewski, S. R., Shetrone, M., Whelan, D. G., ... Zasowski, G. (2014). Discovery of two rare rigidly rotating magnetosphere stars in the apogee survey. Astrophysical Journal Letters, 784(2), [L30]. https://doi.org/10.1088/2041-8205/784/2/L30
Eikenberry, Stephen S. ; Chojnowski, S. Drew ; Wisniewski, John ; Majewski, Steven R. ; Shetrone, Matthew ; Whelan, David G. ; Bizyaev, Dmitry ; Borish, H. Jacob ; Davenport, James R.A. ; Ebelke, Garrett ; Feuillet, Diane ; Frinchaboy, Peter M. ; Garner, Alan ; Hearty, Fred ; Holtzman, Jon ; Li, Zhi Yun ; Mészáros, Sz ; Nidever, David L. ; Schneider, Donald P. ; Skrutskie, Michael ; Wilson, John C. ; Zasowski, Gail. / Discovery of two rare rigidly rotating magnetosphere stars in the apogee survey. In: Astrophysical Journal Letters. 2014 ; Vol. 784, No. 2.
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abstract = "The Apache Point Observatory Galactic Evolution Experiment (APOGEE) - one of the Sloan Digital Sky Survey III programs - is using near-infrared (NIR) spectra of ∼100,000 red giant branch star candidates to study the structure of the Milky Way. In the course of the survey, APOGEE also acquires spectra of hot field stars to serve as telluric calibrators for the primary science targets. We report the serendipitous discovery of two rare, fast-rotating B-stars of the σ Ori E type among those blue field stars observed during the first year of APOGEE operations. Both of the discovered stars display the spectroscopic signatures of rigidly rotating magnetospheres (RRM) common to this class of highly magnetized (B ∼ 10 kGauss) stars, increasing the number of known RRM stars by ∼10{\%}. One (HD 345439) is a main-sequence B-star with unusually strong He absorption (similar to σ Ori E), while the other (HD 23478) fits a {"}He-normal{"} B3IV classification. We combine the APOGEE discovery spectra with other optical and NIR spectra of these two stars, and of σ Ori E itself, to show how NIR spectroscopy can be a uniquely powerful tool for discovering more of these rare objects, which may show little/no RRM signatures in their optical spectra. We discuss the potential for further discovery of σ Ori E type stars, as well as the implications of our discoveries for the population of these objects and insights into their origin and evolution.",
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Eikenberry, SS, Chojnowski, SD, Wisniewski, J, Majewski, SR, Shetrone, M, Whelan, DG, Bizyaev, D, Borish, HJ, Davenport, JRA, Ebelke, G, Feuillet, D, Frinchaboy, PM, Garner, A, Hearty, F, Holtzman, J, Li, ZY, Mészáros, S, Nidever, DL, Schneider, DP, Skrutskie, M, Wilson, JC & Zasowski, G 2014, 'Discovery of two rare rigidly rotating magnetosphere stars in the apogee survey', Astrophysical Journal Letters, vol. 784, no. 2, L30. https://doi.org/10.1088/2041-8205/784/2/L30

Discovery of two rare rigidly rotating magnetosphere stars in the apogee survey. / Eikenberry, Stephen S.; Chojnowski, S. Drew; Wisniewski, John; Majewski, Steven R.; Shetrone, Matthew; Whelan, David G.; Bizyaev, Dmitry; Borish, H. Jacob; Davenport, James R.A.; Ebelke, Garrett; Feuillet, Diane; Frinchaboy, Peter M.; Garner, Alan; Hearty, Fred; Holtzman, Jon; Li, Zhi Yun; Mészáros, Sz; Nidever, David L.; Schneider, Donald P.; Skrutskie, Michael; Wilson, John C.; Zasowski, Gail.

In: Astrophysical Journal Letters, Vol. 784, No. 2, L30, 01.04.2014.

Research output: Contribution to journalArticle

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T1 - Discovery of two rare rigidly rotating magnetosphere stars in the apogee survey

AU - Eikenberry, Stephen S.

AU - Chojnowski, S. Drew

AU - Wisniewski, John

AU - Majewski, Steven R.

AU - Shetrone, Matthew

AU - Whelan, David G.

AU - Bizyaev, Dmitry

AU - Borish, H. Jacob

AU - Davenport, James R.A.

AU - Ebelke, Garrett

AU - Feuillet, Diane

AU - Frinchaboy, Peter M.

AU - Garner, Alan

AU - Hearty, Fred

AU - Holtzman, Jon

AU - Li, Zhi Yun

AU - Mészáros, Sz

AU - Nidever, David L.

AU - Schneider, Donald P.

AU - Skrutskie, Michael

AU - Wilson, John C.

AU - Zasowski, Gail

PY - 2014/4/1

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N2 - The Apache Point Observatory Galactic Evolution Experiment (APOGEE) - one of the Sloan Digital Sky Survey III programs - is using near-infrared (NIR) spectra of ∼100,000 red giant branch star candidates to study the structure of the Milky Way. In the course of the survey, APOGEE also acquires spectra of hot field stars to serve as telluric calibrators for the primary science targets. We report the serendipitous discovery of two rare, fast-rotating B-stars of the σ Ori E type among those blue field stars observed during the first year of APOGEE operations. Both of the discovered stars display the spectroscopic signatures of rigidly rotating magnetospheres (RRM) common to this class of highly magnetized (B ∼ 10 kGauss) stars, increasing the number of known RRM stars by ∼10%. One (HD 345439) is a main-sequence B-star with unusually strong He absorption (similar to σ Ori E), while the other (HD 23478) fits a "He-normal" B3IV classification. We combine the APOGEE discovery spectra with other optical and NIR spectra of these two stars, and of σ Ori E itself, to show how NIR spectroscopy can be a uniquely powerful tool for discovering more of these rare objects, which may show little/no RRM signatures in their optical spectra. We discuss the potential for further discovery of σ Ori E type stars, as well as the implications of our discoveries for the population of these objects and insights into their origin and evolution.

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Eikenberry SS, Chojnowski SD, Wisniewski J, Majewski SR, Shetrone M, Whelan DG et al. Discovery of two rare rigidly rotating magnetosphere stars in the apogee survey. Astrophysical Journal Letters. 2014 Apr 1;784(2). L30. https://doi.org/10.1088/2041-8205/784/2/L30