[en] We report the results of a study designed to test further the basic validity of the seismic models of hot pulsating B subdwarfs that have been developed over the last two decades. Given estimates of the effective temperature, surface gravity, and mass as obtained from a seismic analysis, and given an estimate of the He/H ratio as available from independent spectroscopy, it is possible to compute a “seismic distance” that is suitably corrected for interstellar reddening from a model atmosphere calculation in conjunction with two-band photometry. The test consists of comparing such a distance with that obtained directly from the high-accuracy Gaia parallax measurements that have become available through Data Release 2. Using observed magnitudes in the Gaia G [SUB]BP[/SUB], G [SUB]RP[/SUB] bandpasses as well as ground- based photometry in the Johnson B, V, Strömgren b, y, and SDSS g, r filters, we find that all of our seismic estimates fall within 1σ of their parallax counterparts. In addition, the derived reddening for our target stars is shown to be generally consistent with Galactic dust reddening and extinction maps. These results apply to a sample of 14 pulsating hot B subdwarfs for which seismic models were published in the past. We also derive useful constraints on the distances to two more pulsators that belong to unresolved binary systems. The excellent agreement found between seismic and parallax distances for the bulk of the sample adds further credibility to the seismic models that have been calculated for pulsators of this type.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Fontaine, Gilles; Département de Physique, Université de Montréal, Montréal, QC H3C 3J7, Canada
Bergeron, P.; Département de Physique, Université de Montréal, Montréal, QC H3C 3J7, Canada
Brassard, Pierre; Département de Physique, Université de Montréal, Montréal, QC H3C 3J7, Canada
Charpinet, Stéphane; CNRS, Université de Toulouse, UPS-OMP, Toulouse, France
Randall, S.; ESO, Karl-Schwarzschild-Str. 2, D-85758 Garching bei München, Germany
Van Grootel, Valérie ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Latour, M.; Institute for Astrophysics, Georg-August-University, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
Green, E. M.; Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA)
Language :
English
Title :
Testing Seismic Models of Hot B Subdwarfs with Gaia Data
Publication date :
01 August 2019
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
University of Chicago Press, United States - Illinois
Alam S., Alberati F. D., Allende Prieto C. et al 2015 ApJS 219 12A (SDSS DR12)
Allard F., Wesemael F., Fontaine G., Bergeron P. and Lamontagne R. 1994 AJ 107 1565
Bailer-Jones C. 2015 PASP 127 994
Baran A., Pigulski A., Koziel D. et al 2005 MNRAS 360 737
Bergeron P., Saffer R. A. and Liebert J. 1992 ApJ 394 228
Bern K. and Wramdemark S. 1973 LowOB 8 1
Billères M. and Fontaine G. 2005 ASP Conf. Ser. 334, 14th European Workshop on White Dwarfs ed D. Koester and S. Moehler (San Francisco, CA: ASP) 635
Brassard P., Fontaine G., Billères M. et al 2001 ApJ 563 1013
Brassard P., Fontaine G., Chayer P. and Green E. M. 2010 AIP Conf. Proc. 1273, 17th European White Dwarf Workshop ed K. Werner and T. Rauch (Melville, NY: AIP) 259
Charpinet S. 1999 PhD thesis Univ. de Montréal
Charpinet S., Brassard P., Fontaine G. et al 2019 A&A submitted
Charpinet S., Fontaine G. and Brassard P. 2003 NATO ASIB Proc. 105, White Dwarfs ed D. de Martino (Dordrecht: Kluwer) 69
Charpinet S., Fontaine G., Brassard P. et al 2005a ASP Conf. Ser. 334, 14th European Workshop on White Dwarfs ed D. Koester and S. Moehler (San Francisco, CA: ASP) 619
Charpinet S., Fontaine G., Brassard P. et al 2005b A&A 443 251
Charpinet S., Fontaine G., Brassard P., Chayer P. and Green E. M. 2006a MmSAI 77 358
Charpinet S., Fontaine G., Brassard P., Green E. M. and Chayer P. 2005c A&A 437 575
Charpinet S., Green E. M., Baglin A. et al 2010 A&A 516 L6
Charpinet S., Silvotti R., Bonanno A. et al 2006b A&A 459 565
Charpinet S., Van Grootel V., Fontaine G. et al 2011 A&A 530 A3
Charpinet S., Van Grootel V., Fontaine G. et al 2016 XXIX IAU General Assembly 1, Astronomy in Focus ed P. Benvenuti (Cambridge: Cambridge Univ. Press) 581
Charpinet S., Van Grootel V., Reese D. et al 2008 A&A 489 377
Fontaine G., Brassard P., Charpinet S. et al 2003 ApJ 597 518
Fontaine G., Brassard P., Charpinet S. et al 2012 A&A 539 A12
Gaia Collaboration, Babusiaux C., van Leevwen F. et al 2018 A&A 616 A10 (Gaia DR2)
Green E. M., Fontaine G., Hyde E. A., For B.-Q. and Chayer P. 2008 ASP Conf. Ser. 392, Hot Subdwarf Stars and Related Objects ed U. Heber, S. Jeffery and R. Napiwotzki (San Francisco, CA: ASP) 75
Green E. M., Fontaine G., Reed. M. D. et al 2003 ApJL 583 L31
Heber U. 2016 PASP 128 082001
Hog E., Fabricius C., Makarov V. V. et al 2000 A&A 355 27
Jester S., Schneider D. P., Richards G. T. et al 2005 AJ 130 873
Kilkenny D., Koen C., O'Donoghue D. and Stobie R. S. 1997 MNRAS 285 640
Kilkenny D., O'Donoghue D., Koen C., Lynas-Gray A. E. and van Wyk F. 1998 MNRAS 296 329
Kilkenny D., Stobie R. S., O'Donoghue D. et al 2006 MNRAS 367 1693
Koen C., O'Donoghue D., Kilkenny D. and Pollaco D. L. 2004 NewAR 9 565
Koen C., O'Donoghue D., Kilkenny D., Stobie R. S. and Saffer R. A. 1999 MNRAS 306 213
Landolt A. U. 2009 AJ 137 4186
Latour M., Fontaine G. and Green E. 2014a ASP Conf. Ser. 481, 6th Conf. Hot Subdwarf Stars and Related Objects ed V. Van Grootel et al (San Francisco, CA: ASP) 91
Latour M., Fontaine G., Green E. M., Brassard P. and Chayer P. 2014b ApJ 788 65
Németh P., Kawka A. and Vennes S. 2012 MNRAS 427 2180
O'Donoghue D., Kilkenny D., Koen C. et al 2013 MNRAS 431 240
O'Donoghue D., Lynas-Gray A. E., Kilkenny D., Stobie R. S. and Koen C. 1997 MNRAS 285 657
Østensen R. H., Oreiro R., Solheim J.-E. et al 2010 A&A 513 A6
Otani T., Oswalt T. D., Lynas-Gray A. E. et al 2018 ApJ 859 1450
O'Toole S. J., Heber U. and Benjamin R. A. 2004 A&A 422 1053
Randall S. K., Fontaine G., Charpinet S. et al 2006a ApJ 648 637
Randall S. K., Fontaine G., Green E. M. et al 2006b ApJ 643 1198
Randall S. K., Green E. M., Fontaine G. et al 2006c ApJ 645 1464
Randall S. K., Green E. M., Van Grootel V. et al 2007 A&A 476 1317
Randall S. K., Van Grootel V., Fontaine G., Charpinet S. and Brassard P. 2009 A&A 507 911
Reed M. D., Telting J. H., Ketzer L. et al 2019 MNRAS 483 2282
Schlafly E. F. and Finkbeiner D. P. 2011 ApJ 737 103
Schuh S., Huber J., Dreizler S. et al 2006 A&A 445 31
Van Grootel V. 2008 PhD thesis Univ. de Toulouse
Van Grootel V., Charpinet S., Brassard P., Fontaine G. and Green E. M. 2013 A&A 553 A97
Van Grootel V., Charpinet S., Fontaine G. et al 2008 A&A 488 685
Van Grootel V., Charpinet S., Fontaine G. et al 2010a ApJL 718 L97
Van Grootel V., Charpinet S., Fontaine G., Green E. M. and Brassard P. 2010b A&A 524 63
Villeneuve B., Wesemael F., Fontaine G., Carignan C. and Green R. F. 1995 ApJ 446 646
Wesemael F., Fontaine G., Bergeron P., Lamontagne R. and Green R. F. 1992 AJ 104 203
Zacharias N., Finch C. T., Girard T. M. et al 2013 AJ 145 44
