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

^*Corresponding author for this work

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

21 Citations (Scopus)

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
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
Publication status	Published - 20 May 2004

Keywords

Stars: oscillations
Subdwarfs

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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

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

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.",

keywords = "Stars: oscillations, Subdwarfs",

author = "Reed, {M. D.} and Green, {E. M.} and K. Callerame and Seitenzahl, {I. R.} and White, {B. A.} and Hyde, {E. A.} and Giovanni, {M. K.} and R. {\O}stensen and A. Bronowska and Jeffery, {E. J.} and O. Cordes and S. Falter and H. Edelmann and S. Dreizler and Schuh, {S. L.}",

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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

TY - JOUR

T1 - Discovery of gravity-mode pulsators among subdwarf B stars

T2 - PG 1716+426, the class prototype

AU - Reed, M. D.

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.

PY - 2004/5/20

Y1 - 2004/5/20

N2 - 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.

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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SN - 0004-637X

VL - 607

SP - 445

EP - 450

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 I

ER -

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

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