stars: early-type; stars: fundamental parameters; stars: abundances; stars: massive; stars: individual: HD 93521; X-rays: stars
Abstract :
[en] Context. Owing to its unusual location and its isolation, the nature of the high Galactic latitude O9.5 Vp object HD 93521 is still uncertain. <BR /> Aims: We have collected X-ray and optical observations to characterize the star and its surroundings. <BR /> Methods: X-ray images and spectra are analysed to search for traces of a recent star formation event around HD 93521 and to search for the signature of a possible compact companion. Optical echelle spectra are analysed with plane-parallel model atmosphere codes, assuming either a spherical star or a gravity darkened rotationally flattened star, to infer the effective temperature and surface gravity, and to derive the He, C, N and O abundances of HD 93521. <BR /> Results: The X-ray images reveal no traces of a population of young low-mass stars coeval with HD 93521. The X-ray spectrum of HD 93521 is consistent with a normal late O-type star although with subsolar metallicity. No trace of a compact companion is found in the X-ray data. In the optical spectrum, He and N are found to be overabundant, in line with the effect of rotational mixing in this very fast rotator, whilst C and O are subsolar. A critical comparison with the properties of subdwarf OB stars, indicates that, despite some apparent similarities, HD 93521 does not belong to this category. <BR /> Conclusions: Despite some ambiguities on the runaway status of the star, the most likely explanation is that HD 93521 is a Population I massive O-type star that was ejected from the Galactic plane either through dynamical interactions or a result of a supernova event in a binary system. Based on observations collected at the Observatoire de Haute Provence (France) and with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA member states and the USA (NASA).Hα images are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/546/A77">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/546/A77</A>
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Rauw, Grégor ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales
Morel, Thierry ; Université de Liège - ULiège > GAPHE : Astrophysique observationnelle (sol et espace)
Palate, Matthieu ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales
Language :
English
Title :
The nature of the high Galactic latitude O-star HD 93521: new results from X-ray and optical spectroscopy
scite shows how a scientific paper has been cited by providing the context of the citation, a classification describing whether it supports, mentions, or contrasts the cited claim, and a label indicating in which section the citation was made.
Bibliography
Al-Naimiy, H. M. 1978, Ap&SS, 53, 181
Arnaud, K. A. 1996, in Astronomical Data Analysis Software and Systems V, eds. G. Jacoby, & J. Barnes (San Francisco: ASP), 101, 17
Asplund, M., Grevesse, N., Sauval, A. J., & Scott, P. 2009, ARA&A, 47, 481
Baranne, A., Queloz, D., Mayor, M., et al. 1996, A&AS, 119, 373
Bjorkman, J. E., Ignace, R., Tripp, T. M., & Cassinelli, J. P. 1994, ApJ, 435, 416
Bohlin, R. C., Savage, B. D., & Drake, J. F. 1978, ApJ, 224, 132
Bonnell, I. A., Vine, S. G., & Bate, M. R. 2004, MNRAS, 349, 735
Bressert, E., Bastian, N., Evans, C. J., et al. 2012, A&A, 542, A49
Broos, P. S., Feigelson, E. D., Townsley, L. K., et al. 2007, ApJS, 169, 353
Butler, K., & Giddings, J. R. 1985, in Newsletter of Analysis of Astronomical Spectra, No. 9 (Univ. London)
Claret, A., & Bloemen, S. 2011, A&A, 529, A75
Cruz-González, C., Recillas-Cruz, E., Costero, R., Peimbert, M., & Torres-Peimbert, S. 1974, RMxAA, 1, 211
de Mink, S. E., Langer, N., & Izzard, R. G. 2010, in Active OB stars: structure, evolution, mass-loss and critical limits, eds. C. Neiner, G. Wade, G. Meynet, & G. Peters (Cambridge: Cambridge University Press), IAU Symp., 272, 531
de Wit, W. J., Testi, L., Palla, F., & Zinnecker, H. 2005, A&A, 437, 247
Ebbets, D. C., & Savage, B. D. 1982, ApJ, 262, 234
Espinosa Lara, F., & Rieutord, M. 2011, A&A, 533, A43
Fontaine, G., Brassard, P., Charpinet, S., et al. 2008, in Hot Subdwarf Stars and Related Objects, eds. U. Heber, S. Jeffery, & R. Napiwotzki (San Francisco: ASP), ASP Conf., 392, 231
Geier, S., Heber, U., Edelmann, H., Napiwotzki, R., & Morales-Rueda, L. 2012, in Fifth Meeting on Hot Subdwarf Stars and Related Objects, eds. D. Kilkenny, C. S. Jeffery, & C. Koen (San Francisco: ASP), ASP Conf., 452, 81
Giacconi, R., Rosati, P., Tozzi, P., et al. 2001, ApJ, 551, 624
Giddings, J. R. 1981, Ph.D. Thesis, University of London
Gies, D. R. 1987, ApJS, 64, 545
Hamann, W.-R., Gruschinske, J., Kudritzki, R. P., & Simon, K. P. 1981, A&A, 104, 249
Heber, U. 2009, ARA&A, 47, 211
Heber, U., Hirsch, H., Ströer, A., et al. 2006, Baltic Astron., 15, 91
Heger, A., & Langer, N. 2000, ApJ, 544, 1016
Howarth, I. D. 1997, Observatory, 117, 335
Howarth, I. D., & Reid, A. H. N. 1993, A&A, 279, 148
Howarth, I. D., & Smith, K. C. 2001, MNRAS, 327, 353
Howarth, I. D., Siebert, K.W., Hussein, G. A. J., & Prinja, R. K. 1997, MNRAS, 284, 265
Hubrig, S., Briquet, M., Morel, T., et al. 2008, A&A, 488, 287
Irvine, N. J. 1989, ApJ, 337, L33
Jansen, F., Lumb, D., Altieri, B., et al. 2001, A&A, 365, L1
Kraus, S., Monnier, J. D., Che, X., et al. 2012, ApJ, 744, 19
Krumholz, M. R., Klein, R. I., McKee, C. F., Offner, S. S. R., & Cunningham, A. J. 2009, Science, 323, 754
Lamb, J. B., Oey, M. S., Werk, J. K., & Ingleby, L. D. 2010, ApJ, 725, 1886
La Palombara, N.,Mereghetti, S., Tiengo, A., & Esposito, P. 2012, ApJ 750, L34
Lennon, D. J., Dufton, P. L., Keenan, F. P., & Holmgren, D. E. 1991, A&A, 246, 175
Leonard, P. J. T. 1991, AJ, 101, 562
Leonard, P. J. T., & Duncan, M. J. 1990, ApJ, 353, 486
Massa, D. 1995, ApJ, 438, 376
Massaro, E., Giommi, P., Leto, C., et al. 2009, A&A, 495, 691
Mereghetti, S., Tiengo, A., Esposito, P., et al. 2009, Science, 325, 1222
Mereghetti, S., La Palombara, N., Tiengo, A., et al. 2011, ApJ, 737, 51
Meynet, G., & Maeder, A. 2000, A&A, 361, 101
Moffat, A. F. J., Marchenko, S. V., Seggewiss, W., et al. 1998, A&A, 331, 949
Morel, T. 2011, Bull. Soc. Roy. Sci. Liège, 80, 405
Najarro, F., Hillier, D. J., Puls, J., Lanz, T., & Martins, F. 2006, A&A, 456, 659
Napiwotzki, R., Karl, C. A., Lisker, T., et al. 2004, Ap&SS, 291, 321
Nazé, Y. 2004, Ph.D. Thesis, Liège University
Nazé, Y. 2009, A&A, 506, 1055
Nazé, Y., Rauw, G., Vreux, J.-M., & De Becker, M. 2004, A&A, 417, 667
Nieva, M. F., & Przybilla, N. 2007, A&A, 467, 295
Okazaki, A. T., & Negueruela, I. 2001, A&A, 377, 161
Perruchot, S., Kohler, D., Bouchy, F., et al. 2008, in Ground-based and Airborne Instrumentation for Astronomy II, eds. I. S. McLean, & M. M. Casali, Proc. SPIE, 7014, 70140
Preibisch, T., & Feigelson, E. D. 2005, ApJS, 160, 390
Portegies-Zwart, S. F. 2000, ApJ, 544, 437
Przybilla, N., Nieva, M. F., Heber, U., & Butler, K. 2008, ApJ, 684, L103
Przybilla, N., Firnstein, M., Nieva, M. F., Meynet, G., & Maeder, A. 2010, A&A, 517, A38
Przybilla, N., Nieva, M. F., & Butler, K. 2011, JPhCS, 328, 012015
Rakowski, C. E., Schulz, N. S.,Wolk, S. J., & Testa, P. 2006, ApJ, 649, L111
Ramspeck, M., Heber, U., & Moehler, S. 2001, A&A, 378, 907
Rauw, G. 2011, A&A, 536, A31
Rauw, G., De Becker, M., Gosset, E., Pittard, J.M., & Stevens, I. R. 2003, A&A, 408, 171
Rauw, G., De Becker, M., van Winkel, H., et al. 2008, A&A, 487, 659
Rzaev, A. K., & Panchuk, V. E. 2006, Astron. Rep., 50, 31
Selier, R., Heydari-Malayeri, M., & Gouliermis, D. A. 2011, A&A, 529, A40
Silva, M. D. V., & Napiwotzki, R. 2011, MNRAS, 411, 2596
Smith, R. K., Brickhouse, N. S., Liedahl, D. A., & Raymond, J. C. 2001, ApJ, 556, L91
Smith, M. A., Cohen, D. H., Gu, M. F., et al. 2004, ApJ, 600, 972
Strüder, L., Briel, U., Dennerl, K., et al. 2001, A&A, 365, L18
Tiengo, A., Mereghetti, S., Israel, G. L., & Stella, L. 2004, Nucl. Phys. B, Proc. Suppl., 132, 705
Torres-Dodgen, A. V., Tapia, M., & Carroll, M. 1991, MNRAS, 249, 1
Turner, M. J. L., Abbey, A., Arnaud, M., et al. 2001, A&A, 365, L27
Unglaub, K. 2008, in Hot Subdwarf Stars and Related Objects, eds. U. Heber, S. Jeffery, & R. Napiwotzki (San Francisco: ASP), ASP Conf., 392, 95
van Leeuwen, F. 2007, A&A, 474, 653
Villamariz, M. R., Herrero, A., Becker, S. R., & Butler, K. 2002, A&A, 388, 940
Villamariz, M. R., & Herrero, A. 2005, A&A, 442, 263
von Zeipel, H., 1924, MNRAS, 84, 665
Vrancken, M., Hensberge, H., David, M., & Verschueren, W. 1997, A&A, 320, 878
Weidner, C., Kroupa, P., & Bonnell, I. A. D. 2010, MNRAS, 401, 275
Woudt, P. A., Warner, B., & Kilkenny, D. 2007, in 15th European Workshop on White Dwarfs, eds. R. Napiwotzki, & M. R. Burleigh (San Francisco: ASP), ASP Conf., 372, 619
Similar publications
Sorry the service is unavailable at the moment. Please try again later.
This website uses cookies to improve user experience. Read more
Save & Close
Accept all
Decline all
Show detailsHide details
Cookie declaration
About cookies
Strictly necessary
Performance
Strictly necessary cookies allow core website functionality such as user login and account management. The website cannot be used properly without strictly necessary cookies.
This cookie is used by Cookie-Script.com service to remember visitor cookie consent preferences. It is necessary for Cookie-Script.com cookie banner to work properly.
Performance cookies are used to see how visitors use the website, eg. analytics cookies. Those cookies cannot be used to directly identify a certain visitor.
Used to store the attribution information, the referrer initially used to visit the website
Cookies are small text files that are placed on your computer by websites that you visit. Websites use cookies to help users navigate efficiently and perform certain functions. Cookies that are required for the website to operate properly are allowed to be set without your permission. All other cookies need to be approved before they can be set in the browser.
You can change your consent to cookie usage at any time on our Privacy Policy page.
