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Title: GD358: Three Decades of Observations for the In-depth Asteroseismology of a DBV Star

Abstract

Here, we report on the analysis of 34 years of photometric observations of the pulsating helium atmosphere white dwarf GD358. The complete data set includes archival data from 1982 to 2006, and 1195.2 hr of new observations from 2007 to 2016. From this data set, we extract 15 frequencies representing g-mode pulsation modes, adding 4 modes to the 11 modes known previously. We present evidence that these 15 modes are ℓ = 1 modes, 13 of which belong to a consecutive sequence in radial overtone k. We perform a detailed asteroseismic analysis using models that include parameterized, complex, carbon and oxygen core composition profiles to fit the periods. Recent spectroscopic analyses place GD358 near the red edge of the DBV instability strip, at 24,000 ± 500 K and a $$\mathrm{log}\,{\text{}}g$$ of 7.8 ± 0.08 dex. The surface gravity translates to a mass range of 0.455–0.540 $${M}_{\odot }$$. Our best-fit model has a temperature of 23,650 K and a mass of 0.5706 $${M}_{\odot }$$. That is slightly more massive than what is suggested by the most recent spectroscopy. We find a pure helium layer mass of 10–5.50, consistent with the result of previous studies and the outward diffusion of helium over time.

Authors:
 [1];  [2]; ORCiD logo [3]; ORCiD logo [4];  [2];  [5];  [6];  [7];  [7];  [7];  [7];  [7];  [7];  [7];  [7];  [7];  [8];  [9];  [9];  [10] more »;  [11];  [11];  [11];  [12];  [12];  [13];  [13];  [14];  [15];  [16];  [16];  [16];  [16];  [15];  [17];  [18];  [18];  [18];  [18]; ORCiD logo [19];  [20];  [21] « less
  1. Penn State Worthington Scranton, Dunmore, PA (United States)
  2. Univ. of Delaware, Newark, DE (United States); Delaware Asteroseismic Research Center, Greenville, DE (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Delaware Asteroseismic Research Center, Greenville, DE (United States); Univ. of Texas, Austin, TX (United States)
  5. Univ. of Texas, Austin, TX (United States)
  6. Delaware Asteroseismic Research Center, Greenville, DE (United States)
  7. Meyer Observatory and Central Texas Astronomical Society, Waco, TX (United States)
  8. Korea Astronomy and Space Science Institute, Daejeon (Republic of Korea)
  9. National Astronomical Observatories, Beijing (People's Republic of China)
  10. Fesenkov Astrophysical Institute, Almaty (Kazakhstan)
  11. Ukrainian National Academy of Sciences, Kyiv (Ukraine); Russian Academy of Sciences, Kabardino-Balkaria Republic (Russian Federation)
  12. Vilnius Univ., Vilnius (Lithuania)
  13. Canakkale Onsekiz Mart Univ. (Turkey)
  14. Astronomical Observatory of the Jagiellonian Univ., Cracow (Poland); Cracow Pedagogical Univ., Krakow (Poland)
  15. Cracow Pedagogical Univ., Krakow (Poland)
  16. Astronomical Observatory of the Jagiellonian Univ., Cracow (Poland)
  17. Univ. Wien, Wien (Austria)
  18. Eberhard Karls Univ. Tuebingen, Tuebingen (Germany)
  19. Konkoly Observatory, Budapest (Hungary)
  20. Baylor Univ., Waco, TX (United States)
  21. Canakkale Onsekiz Mart Univ., Canakkale (Turkey)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1493562
Report Number(s):
LA-UR-19-20050
Journal ID: ISSN 1538-4357
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 871; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Stars: oscillations; Stars: variable; Stars: pulsations; general: white dwarfs; Stars GD358

Citation Formats

Bischoff-Kim, Agnès, Provencal, J. L., Bradley, Paul Andrew, Montgomery, M. H., Shipman, H. L., Harrold, Samuel T., Howard, B., Strickland, W., Chandler, D., Campbell, D., Arredondo, A., Linn, R., Russell, D. P., Doyle, D., Brickhouse, A., Peters, D., Kim, S. -L., Jiang, X. J., Mao, Y. -N., Kusakin, A. V., Sergeev, A. V., Andreev, M., Velichko, S., Janulis, R., Pakstiene, E., Aliçavuş, F., Horoz, N., Zola, S., Ogłoza, W., Koziel-Wierzbowska, D., Kundera, T., Jableka, D., Debski, B., Baran, A., Meingast, S., Nagel, T., Loebling, L., Heinitz, C., Hoyer, D., Bognár, Zs., Castanheira, B. G., and Erdem, A. GD358: Three Decades of Observations for the In-depth Asteroseismology of a DBV Star. United States: N. p., 2019. Web. doi:10.3847/1538-4357/aae2b1.
Bischoff-Kim, Agnès, Provencal, J. L., Bradley, Paul Andrew, Montgomery, M. H., Shipman, H. L., Harrold, Samuel T., Howard, B., Strickland, W., Chandler, D., Campbell, D., Arredondo, A., Linn, R., Russell, D. P., Doyle, D., Brickhouse, A., Peters, D., Kim, S. -L., Jiang, X. J., Mao, Y. -N., Kusakin, A. V., Sergeev, A. V., Andreev, M., Velichko, S., Janulis, R., Pakstiene, E., Aliçavuş, F., Horoz, N., Zola, S., Ogłoza, W., Koziel-Wierzbowska, D., Kundera, T., Jableka, D., Debski, B., Baran, A., Meingast, S., Nagel, T., Loebling, L., Heinitz, C., Hoyer, D., Bognár, Zs., Castanheira, B. G., & Erdem, A. GD358: Three Decades of Observations for the In-depth Asteroseismology of a DBV Star. United States. doi:10.3847/1538-4357/aae2b1.
Bischoff-Kim, Agnès, Provencal, J. L., Bradley, Paul Andrew, Montgomery, M. H., Shipman, H. L., Harrold, Samuel T., Howard, B., Strickland, W., Chandler, D., Campbell, D., Arredondo, A., Linn, R., Russell, D. P., Doyle, D., Brickhouse, A., Peters, D., Kim, S. -L., Jiang, X. J., Mao, Y. -N., Kusakin, A. V., Sergeev, A. V., Andreev, M., Velichko, S., Janulis, R., Pakstiene, E., Aliçavuş, F., Horoz, N., Zola, S., Ogłoza, W., Koziel-Wierzbowska, D., Kundera, T., Jableka, D., Debski, B., Baran, A., Meingast, S., Nagel, T., Loebling, L., Heinitz, C., Hoyer, D., Bognár, Zs., Castanheira, B. G., and Erdem, A. Thu . "GD358: Three Decades of Observations for the In-depth Asteroseismology of a DBV Star". United States. doi:10.3847/1538-4357/aae2b1.
@article{osti_1493562,
title = {GD358: Three Decades of Observations for the In-depth Asteroseismology of a DBV Star},
author = {Bischoff-Kim, Agnès and Provencal, J. L. and Bradley, Paul Andrew and Montgomery, M. H. and Shipman, H. L. and Harrold, Samuel T. and Howard, B. and Strickland, W. and Chandler, D. and Campbell, D. and Arredondo, A. and Linn, R. and Russell, D. P. and Doyle, D. and Brickhouse, A. and Peters, D. and Kim, S. -L. and Jiang, X. J. and Mao, Y. -N. and Kusakin, A. V. and Sergeev, A. V. and Andreev, M. and Velichko, S. and Janulis, R. and Pakstiene, E. and Aliçavuş, F. and Horoz, N. and Zola, S. and Ogłoza, W. and Koziel-Wierzbowska, D. and Kundera, T. and Jableka, D. and Debski, B. and Baran, A. and Meingast, S. and Nagel, T. and Loebling, L. and Heinitz, C. and Hoyer, D. and Bognár, Zs. and Castanheira, B. G. and Erdem, A.},
abstractNote = {Here, we report on the analysis of 34 years of photometric observations of the pulsating helium atmosphere white dwarf GD358. The complete data set includes archival data from 1982 to 2006, and 1195.2 hr of new observations from 2007 to 2016. From this data set, we extract 15 frequencies representing g-mode pulsation modes, adding 4 modes to the 11 modes known previously. We present evidence that these 15 modes are ℓ = 1 modes, 13 of which belong to a consecutive sequence in radial overtone k. We perform a detailed asteroseismic analysis using models that include parameterized, complex, carbon and oxygen core composition profiles to fit the periods. Recent spectroscopic analyses place GD358 near the red edge of the DBV instability strip, at 24,000 ± 500 K and a $\mathrm{log}\,{\text{}}g$ of 7.8 ± 0.08 dex. The surface gravity translates to a mass range of 0.455–0.540 ${M}_{\odot }$. Our best-fit model has a temperature of 23,650 K and a mass of 0.5706 ${M}_{\odot }$. That is slightly more massive than what is suggested by the most recent spectroscopy. We find a pure helium layer mass of 10–5.50, consistent with the result of previous studies and the outward diffusion of helium over time.},
doi = {10.3847/1538-4357/aae2b1},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 871,
place = {United States},
year = {2019},
month = {1}
}

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