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

Journal Article · · The Astrophysical Journal (Online)
 [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)
+ Show Author Affiliations

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.

Research Organization:
Los Alamos National Laboratory (LANL)
Sponsoring Organization:
USDOE
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1493562
Report Number(s):
LA-UR-19-20050
Journal Information:
The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 871; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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The formation and evolution of hydrogen-deficient post-AGB white dwarfs: the emerging chemical profile and the expectations for the PG1159-DB-DQ evolutionary connection text January 2005

Cited By (3)

Pulsating white dwarfs: new insights journal September 2019
TESS first look at evolved compact pulsators: Asteroseismology of the pulsating helium-atmosphere white dwarf TIC 257459955 journal November 2019
TESS first look at evolved compact pulsators: asteroseismology of the pulsating helium-atmosphere white dwarf TIC 257459955 text January 2019

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Stars GD358
Stars: oscillations
Stars: pulsations
Stars: variable
general: white dwarfs