Discovery of gravity-mode pulsators among subdwarf B stars: PG 1716+426, the class prototype

M. D. Reed; E. M. Green; K. Callerame; I. R. Seitenzahl; B. A. White; E. A. Hyde; M. K. Giovanni; R. Østensen; A. Bronowska; E. J. Jeffery; O. Cordes; S. Falter; H. Edelmann; S. Dreizler; S. L. Schuh

doi:10.1086/383260

Discovery of gravity-mode pulsators among subdwarf B stars: PG 1716+426, the class prototype

M. D. Reed, E. M. Green, K. Callerame, I. R. Seitenzahl, B. A. White, E. A. Hyde, M. K. Giovanni, R. Østensen, A. Bronowska, E. J. Jeffery, O. Cordes, S. Falter, H. Edelmann, S. Dreizler, S. L. Schuh

Steward Observatory

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

A new class of pulsating subdwarf B stars has recently been announced by Green and coworkers. Here we present a follow-up paper describing our observations and the pulsation structure of the class prototype PG 1716+426. The oscillations are multiperiodic with periods between 0.8 and 1.4 hr (180-340 μHz) and semiamplitudes less than 0.2%. We also observe that the periods and amplitudes appear variable, making the pulsation structure of PG 1716 complicated. The periods are an order of magnitude longer than those seen in EC 14026 (sdBV) stars, implying that they are gravity modes rather than pressure modes. As such, they represent a new class of variable star.

Original language	English (US)
Pages (from-to)	445-450
Number of pages	6
Journal	Astrophysical Journal
Volume	607
Issue number	1 I
DOIs	https://doi.org/10.1086/383260
State	Published - May 20 2004

Keywords

Stars: oscillations
Subdwarfs

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/383260

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Reed, M. D., Green, E. M., Callerame, K., Seitenzahl, I. R., White, B. A., Hyde, E. A., Giovanni, M. K., Østensen, R., Bronowska, A., Jeffery, E. J., Cordes, O., Falter, S., Edelmann, H., Dreizler, S., & Schuh, S. L. (2004). Discovery of gravity-mode pulsators among subdwarf B stars: PG 1716+426, the class prototype. Astrophysical Journal, 607(1 I), 445-450. https://doi.org/10.1086/383260

Reed, MD, Green, EM, Callerame, K, Seitenzahl, IR, White, BA, Hyde, EA, Giovanni, MK, Østensen, R, Bronowska, A, Jeffery, EJ, Cordes, O, Falter, S, Edelmann, H, Dreizler, S & Schuh, SL 2004, 'Discovery of gravity-mode pulsators among subdwarf B stars: PG 1716+426, the class prototype', Astrophysical Journal, vol. 607, no. 1 I, pp. 445-450. https://doi.org/10.1086/383260

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abstract = "A new class of pulsating subdwarf B stars has recently been announced by Green and coworkers. Here we present a follow-up paper describing our observations and the pulsation structure of the class prototype PG 1716+426. The oscillations are multiperiodic with periods between 0.8 and 1.4 hr (180-340 μHz) and semiamplitudes less than 0.2%. We also observe that the periods and amplitudes appear variable, making the pulsation structure of PG 1716 complicated. The periods are an order of magnitude longer than those seen in EC 14026 (sdBV) stars, implying that they are gravity modes rather than pressure modes. As such, they represent a new class of variable star.",

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AU - Green, E. M.

AU - Callerame, K.

AU - Seitenzahl, I. R.

AU - White, B. A.

AU - Hyde, E. A.

AU - Giovanni, M. K.

AU - Østensen, R.

AU - Bronowska, A.

AU - Jeffery, E. J.

AU - Cordes, O.

AU - Falter, S.

AU - Edelmann, H.

AU - Dreizler, S.

AU - Schuh, S. L.

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AB - A new class of pulsating subdwarf B stars has recently been announced by Green and coworkers. Here we present a follow-up paper describing our observations and the pulsation structure of the class prototype PG 1716+426. The oscillations are multiperiodic with periods between 0.8 and 1.4 hr (180-340 μHz) and semiamplitudes less than 0.2%. We also observe that the periods and amplitudes appear variable, making the pulsation structure of PG 1716 complicated. The periods are an order of magnitude longer than those seen in EC 14026 (sdBV) stars, implying that they are gravity modes rather than pressure modes. As such, they represent a new class of variable star.

KW - Stars: oscillations

KW - Subdwarfs

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Discovery of gravity-mode pulsators among subdwarf B stars: PG 1716+426, the class prototype

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