Zobrazeno 1 - 10
of 34
pro vyhledávání: '"HILLWIG, T. C."'
Autor:
Douchin, D., De Marco, O., Jacoby, G. H., Hillwig, T. C., Frew, D. J., Bojicic, I., Jasniewicz, G., Parker, Q. A.
Why 80% of planetary nebulae are not spherical is not yet understood. The Binary Hypothesis states that a companion to the progenitor of the central star of a planetary nebula is required to shape the nebula and even for a planetary nebula to be form
Externí odkaz:
http://arxiv.org/abs/1210.6865
Autor:
Douchin, D., De Marco, O., Jacoby, G. H., Hillwig, T. C., Frew, D. J., Bojicic, I., Jasniewicz, G., Parker, Q. A.
There is no quantitative theory to explain why a high 80% of all planetary nebulae are non-spherical. The Binary Hypothesis states that a companion to the progenitor of a central star of planetary nebula is required to shape the nebula and even for a
Externí odkaz:
http://arxiv.org/abs/1210.6226
We report on new radial velocity measurements of massive stars that are either suspected binaries or lacking prior observations. This is part of a survey to identify and characterize spectroscopic binaries among O-type stars with the goal of comparin
Externí odkaz:
http://arxiv.org/abs/1209.2135
Autor:
Miszalski, B., Crowther, P. A., De Marco, O., Köppen, J., Moffat, A. F. J., Acker, A., Hillwig, T. C.
We report on the serendipitous discovery of the first central star of a planetary nebula (PN) that mimics the helium- and nitrogen-rich WN sequence of massive Wolf-Rayet (WR) stars. The central star of IC 4663 (PN G346.2-08.2) is dominated by broad H
Externí odkaz:
http://arxiv.org/abs/1203.3303
Autor:
Kijbunchoo, Nutsinee, Clayton, Geoffrey C., Vieux, Timothy C., Dickerman, N., Hillwig, T. C., Welch, D. L., Pagnotta, Ashley, Tang, Sumin, Grindlay, J. E., Henden, A.
NSV 11154 has been confirmed as a new member of the rare hydrogen deficient R Coronae Borealis (RCB) stars based on new photometric and spectroscopic data. Using new photometry, as well as archival plates from the Harvard archive, we have constructed
Externí odkaz:
http://arxiv.org/abs/1108.4481
Autor:
Caballero-Nieves, S. M., Gies, D. R., Bolton, C. T., Hadrava, P., Herrero, A., Hillwig, T. C., Howell, S. B., Huang, W., Kaper, L., Koubsky, P., McSwain, M. V.
Publikováno v:
Astrophys.J.701:1895-1905,2009
We present an examination of high resolution, ultraviolet spectroscopy from Hubble Space Telescope of the photospheric spectrum of the O-supergiant in the massive X-ray binary HD 226868 = Cyg X-1. We analyzed this and ground-based optical spectra to
Externí odkaz:
http://arxiv.org/abs/0907.2422
Autor:
Williams, S. J., Gies, D. R., Henry, T. J., Orosz, J. A., McSwain, M. V., Hillwig, T. C., Penny, L. R., Sonneborn, G., Iping, R., van der Hucht, K. A., Kaper, L.
Publikováno v:
Astrophys.J.682:492-498,2008
We present results from an optical spectroscopic investigation of the massive binary system [L72] LH~54-425 in the LH 54 OB association in the Large Magellanic Cloud. We revise the ephemeris of [L72] LH 54-425 and find an orbital period of 2.247409 +
Externí odkaz:
http://arxiv.org/abs/0802.4232
Autor:
Gies, D. R., Bolton, C. T., Blake, R. M., Caballero-Nieves, S. M., Crenshaw, D. M., Hadrava, P., Herrero, A., Hillwig, T. C., Howell, S. B., Huang, W., Kaper, L., Koubsky, P., McSwain, M. V.
We present results from Hubble Space Telescope UV spectroscopy of the massive X-ray binary system, HD226868 = Cyg X-1. The spectra were obtained at both orbital conjunction phases in two separate runs in 2002 and 2003 when the system was in the X-ray
Externí odkaz:
http://arxiv.org/abs/0801.4286
Autor:
Grundstrom, E. D., Gies, D. R., Hillwig, T. C., McSwain, M. V., Smith, N., Gehrz, R. D., Stahl, O., Kaufer, A.
Publikováno v:
Astrophys.J.667:505-519,2007
The massive interacting binary RY Scuti is an important representative of an active mass-transferring system that is changing before our eyes and which may be an example of the formation of a Wolf-Rayet star through tidal stripping. Utilizing new and
Externí odkaz:
http://arxiv.org/abs/0706.3206
Autor:
Hillwig, T. C., Gies, D. R., Huang, W., McSwain, M. V., Stark, M. A., van der Meer, A., Kaper, L.
Publikováno v:
Astrophys.J. 615 (2004) 422-431
We present spectroscopy of the microquasar SS 433 obtained near primary eclipse and disk precessional phase Psi = 0.0, when the accretion disk is expected to be most ``face-on''. The likelihood of observing the spectrum of the mass donor is maximized
Externí odkaz:
http://arxiv.org/abs/astro-ph/0403634