Zobrazeno 1 - 10
of 67
pro vyhledávání: '"Prinja, Raman"'
UV wind line variability in OB stars appears to be universal. To quantify this variation and to estimate its effect on a mass loss rate determined from a single observation, we use the IUE archive to identify non-peculiar OB stars with well developed
Externí odkaz:
http://arxiv.org/abs/2407.01444
Autor:
Parsons, Timothy N., Prinja, Raman K., Bernini-Peron, Matheus, Fullerton, Alex W., Massa, Derck L., Oskinova, Lidia M., Pauli, Daniel, Sander, Andreas A. C., Rickard, Matthew J.
Accurate determination of mass-loss rates from massive stars is important to understanding stellar and galactic evolution and enrichment of the interstellar medium. Large-scale structure and variability in stellar winds have significant effects on ma
Externí odkaz:
http://arxiv.org/abs/2401.01240
Autor:
Massa, Derck, Prinja, Raman K.
UV wind line variability in OB stars appears to be universal. We review the evidence that the variability is due to large, dense, optically thick structures rooted in or near the photosphere. Using repeated bservations and a simple model we translate
Externí odkaz:
http://arxiv.org/abs/2207.14384
Autor:
Gayley, Ken, Vink, Jorick S., ud-Doula, Asif, David-Uraz, Alexandre, Ignace, Richard, Prinja, Raman, St-Louis, Nicole, Ekström, Sylvia, Nazé, Yaël, Shenar, Tomer, Scowen, Paul A., Sudnik, Natallia, Owocki, Stan P., Sundqvist, Jon O., Driessen, Florian A., Hennicker, Levin
The most massive stars are thought to lose a significant fraction of their mass in a steady wind during the main-sequence and blue supergiant phases. This in turn sets the stage for their further evolution and eventual supernova, with consequences fo
Externí odkaz:
http://arxiv.org/abs/2111.11633
The structured winds of single massive stars can be classified into two broad groups: stochastic structure and organized structure. While the former is typically identified with clumping, the latter is typically associated with rotational modulations
Externí odkaz:
http://arxiv.org/abs/2007.03359
PolStar -- An Explorer-Class FUV Spectropolarimetry Mission to Map the Environments of Massive Stars
Autor:
Scowen, Paul, Ignace, Richard, Neiner, Coralie, Wade, Gregg, Beasley, Matt, Bjorkman, Jon, Bouret, Jean-Claude, Casini, Roberto, Alemán, Tanausu del Pino, Edgington, Samantha, Gayley, Ken, Guinan, Ed, Hoffman, Jennifer, Howarth, Ian, Hull, Tony, Sainz, Rafael Manso, Naze, Yael, Nordt, Alison, Owocki, Stan, Petrinec, Steve, Prinja, Raman, Sana, Hugues, Shultz, Matt, Sparks, William, St-Louis, Nicole, Tillier, Clem, Bueno, Javier Trujillo, Vasudevan, Gopal, Woodruff, Bob
PolStar is an Explorer-class far ultraviolet (FUV) spectropolarimetry mission designed to target massive stars and their environments. PolStar will take advantage of resonance lines only available in the FUV to measure for the first time the magnetic
Externí odkaz:
http://arxiv.org/abs/1911.06724
We present new, contemporaneous HST STIS and XMM observations of the O7 III(n)((f)) star xi Per. We supplement the new data with archival IUE spectra, to analyze the variability of the wind lines and X-ray flux of xi Pper. The variable wind of this s
Externí odkaz:
http://arxiv.org/abs/1901.09959
We present e-MERLIN 21 cm (L-band) observations of single luminous OB stars in the Cygnus OB2 association, from the COBRaS Legacy programme. The radio observations potentially offer the most straightforward, least model-dependent, determinations of m
Externí odkaz:
http://arxiv.org/abs/1607.08828
Akademický článek
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Autor:
Prinja, Raman, Urbaneja, Miguel
We report on high-resolution optical time-series spectroscopy of the central star of the `Eskimo' planetary nebula NGC~2392. Datasets were secured with the ESO 2.3m in 2006 March and CFHT 3.6m in 2010 March to diagnose the fast wind and photospheric
Externí odkaz:
http://arxiv.org/abs/1403.1480