PRECISE ATMOSPHERIC PARAMETERS FOR THE SHORTEST-PERIOD BINARY WHITE DWARFS: GRAVITATIONAL WAVES, METALS, AND PULSATIONS

被引：69

作者：

Gianninas, A. ^{[1
]}

Dufour, P. ^{[2
]}

Kilic, Mukremin ^{[1
]}

Brown, Warren R. ^{[3
]}

Bergeron, P. ^{[2
]}

Hermes, J. J. ^{[4
]}

机构：

[1] Univ Oklahoma, Homer L Dodge Dept Phys & Astron, Norman, OK 73019 USA

[2] Univ Montreal, Dept Phys, Montreal, PQ H3C 3J7, Canada

[3] Smithsonian Astrophys Observ, Cambridge, MA 02138 USA

[4] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 794卷 / 01期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

binaries: close; stars: abundances; stars: fundamental parameters; techniques: spectroscopic; white dwarfs; EXTREMELY LOW-MASS; 3D MODEL ATMOSPHERES; SURFACE GRAVITY DISTRIBUTION; CETI INSTABILITY STRIP; MILLISECOND PULSAR; ECLIPSING BINARY; SPECTROSCOPIC ANALYSIS; DEBRIS DISKS; RADIATIVE LEVITATION; PLANETARY SYSTEMS;

D O I：

10.1088/0004-637X/794/1/35

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a detailed spectroscopic analysis of 61 low-mass white dwarfs and provide precise atmospheric parameters, masses, and updated binary system parameters based on our new model atmosphere grids and the most recent evolutionary model calculations. For the first time, we measure systematic abundances of He, Ca, and Mg for metal-rich, extremely low mass white dwarfs and examine the distribution of these abundances as a function of effective temperature and mass. Based on our preliminary results, we discuss the possibility that shell flashes may be responsible for the presence of the observed He and metals. We compare stellar radii derived from our spectroscopic analysis to model-independent measurements and find good agreement except for white dwarfs with T-eff less than or similar to 10,000 K. We also calculate the expected gravitational wave strain for each system and discuss their significance to the eLISA space-borne gravitational wave observatory. Finally, we provide an update on the instability strip of extremely low mass white dwarf pulsators.

引用

页数：18

共 107 条

[1] THE TENTH DATA RELEASE OF THE SLOAN DIGITAL SKY SURVEY: FIRST SPECTROSCOPIC DATA FROM THE SDSS-III APACHE POINT OBSERVATORY GALACTIC EVOLUTION EXPERIMENT [J].

Ahn, Christopher P. ;

Alexandroff, Rachael ;

Allende Prieto, Carlos ;

Anders, Friedrich ;

Anderson, Scott F. ;

Anderton, Timothy ;

Andrews, Brett H. ;

Aubourg, Eric ;

Bailey, Stephen ;

Bastien, Fabienne A. ;

Bautista, Julian E. ;

Beers, Timothy C. ;

Beifiori, Alessandra ;

Bender, Chad F. ;

Berlind, Andreas A. ;

Beutler, Florian ;

Bhardwaj, Vaishali ;

Bird, Jonathan C. ;

Bizyaev, Dmitry ;

Blake, Cullen H. ;

Blanton, Michael R. ;

Blomqvist, Michael ;

Bochanski, John J. ;

Bolton, Adam S. ;

Borde, Arnaud ;

Bovy, Jo ;

Bradley, Alaina Shelden ;

Brandt, W. N. ;

Brauer, Dorothee ;

Brinkmann, J. ;

Brownstein, Joel R. ;

Busca, Nicolas G. ;

Carithers, William ;

Carlberg, Joleen K. ;

Carnero, Aurelio R. ;

Carr, Michael A. ;

Chiappini, Cristina ;

Chojnowski, S. Drew ;

Chuang, Chia-Hsun ;

Comparat, Johan ;

Crepp, Justin R. ;

Cristiani, Stefano ;

Croft, Rupert A. C. ;

Cuesta, Antonio J. ;

Cunha, Katia ;

da Costa, Luiz N. ;

Dawson, Kyle S. ;

De Lee, Nathan ;

Dean, Janice D. R. ;

Delubac, Timothee .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2014, 211 (02)

[2] New evolutionary sequences for extremely low-mass white dwarfs Homogeneous mass and age determinations and asteroseismic prospects [J].

Althaus, Leandro G. ;

Miller Bertolami, Marcelo M. ;

Corsico, Alejandro H. .

ASTRONOMY & ASTROPHYSICS, 2013, 557

[3]

[Anonymous], 2013, GW Notes

[4] A Massive Pulsar in a Compact Relativistic Binary [J].

Antoniadis, John ;

Freire, Paulo C. C. ;

Wex, Norbert ;

Tauris, Thomas M. ;

Lynch, Ryan S. ;

van Kerkwijk, Marten H. ;

Kramer, Michael ;

Bassa, Cees ;

Dhillon, Vik S. ;

Driebe, Thomas ;

Hessels, Jason W. T. ;

Kaspi, Victoria M. ;

Kondratiev, Vladislav I. ;

Langer, Norbert ;

Marsh, Thomas R. ;

McLaughlin, Maura A. ;

Pennucci, Timothy T. ;

Ransom, Scott M. ;

Stairs, Ingrid H. ;

van Leeuwen, Joeri ;

Verbiest, Joris P. W. ;

Whelan, David G. .

SCIENCE, 2013, 340 (6131) :448

[5] THE FREQUENCY OF DEBRIS DISKS AT WHITE DWARFS [J].

Barber, Sara D. ;

Patterson, Adam J. ;

Kilic, Mukremin ;

Leggett, S. K. ;

Dufour, P. ;

Bloom, J. S. ;

Starr, D. L. .

ASTROPHYSICAL JOURNAL, 2012, 760 (01)

[6]

Beauchamp A, 1996, ASTR SOC P, V96, P295

[7] Spectroscopic studies of DB white dwarfs: Improved stark profiles for optical transitions of neutral helium [J].

Beauchamp, A ;

Wesemael, F ;

Bergeron, P .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1997, 108 (02) :559-573

[8] A SPECTROSCOPIC DETERMINATION OF THE MASS-DISTRIBUTION OF DA WHITE-DWARFS [J].

BERGERON, P ;

SAFFER, RA ;

LIEBERT, J .

ASTROPHYSICAL JOURNAL, 1992, 394 (01) :228-247

[9] OPTICAL AND ULTRAVIOLET ANALYSES OF ZZ CETI STARS AND STUDY OF THE ATMOSPHERIC CONVECTIVE EFFICIENCY IN DA WHITE-DWARFS [J].

BERGERON, P ;

WESEMAEL, F ;

LAMONTAGNE, R ;

FONTAINE, G ;

SAFFER, RA ;

ALLARD, NF .

ASTROPHYSICAL JOURNAL, 1995, 449 (01) :258-279

[10] A COMPREHENSIVE SPECTROSCOPIC ANALYSIS OF DB WHITE DWARFS [J].

Bergeron, P. ;

Wesemael, F. ;

Dufour, Pierre ;

Beauchamp, A. ;

Hunter, C. ;

Saffer, Rex A. ;

Gianninas, A. ;

Ruiz, M. T. ;

Limoges, M. -M. ;

Dufour, Patrick ;

Fontaine, G. ;

Liebert, James .

ASTROPHYSICAL JOURNAL, 2011, 737 (01)

← 1 2 3 4 5 6 7 8 9 10 →