Zobrazeno 1 - 10
of 103
pro vyhledávání: '"Massa, Derck"'
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:
Gordon, Karl D., Fitzpatrick, E. L., Massa, Derck, Bohlin, Ralph, Chastenet, Jeremy, Murray, Claire E., Clayton, Geoffrey C., Lennon, Daniel J., Misselt, Karl A., Sandstrom, Karin
The Small Magellanic Cloud (SMC) shows a large variation in ultraviolet (UV) dust extinction curves, ranging from Milky Way-like (MW) to significantly steeper curves with no detectable 2175 A bump. This result is based on a sample of only nine sightl
Externí odkaz:
http://arxiv.org/abs/2405.12792
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:
Gordon, Karl D., Clayton, Geoffrey C., Decleir, Marjorie, Fitzpatrick, E. L., Massa, Derck, Misselt, Karl A., Tollerud, Erik J.
Dust extinction is one of the fundamental measurements of dust grain sizes, compositions, and shapes. Most of the wavelength dependent variations seen in Milky Way extinction are strongly correlated with the single parameter R(V)=A(V)/E(B-V). Existin
Externí odkaz:
http://arxiv.org/abs/2304.01991
Autor:
Cashman, Frances H., Fox, Andrew J., Wakker, Bart P., Ashley, Trisha, Massa, Derck, Jenkins, Edward B., Krishnarao, Dhanesh, Lockman, Felix J., Benjamin, Robert A., Bordoloi, Rongmon, Kim, Tae-Sun
We characterize the chemical and physical conditions in an outflowing high-velocity cloud in the inner Galaxy. We report a super-solar metallicity of [O/H] = $+0.36\pm0.12$ for the high-velocity cloud at $v_\mathrm{LSR}$ = 125.6 km s$^{-1}$ toward th
Externí odkaz:
http://arxiv.org/abs/2210.11583
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
We analyze low resolution Spitzer infrared (IR) 5-14 micron spectra of the diffuse emission toward a carefully selected sample of stars. The sample is composed of sight lines toward stars that have well determined ultraviolet (UV) extinction curves a
Externí odkaz:
http://arxiv.org/abs/2112.02631
We produce a set of 72 NIR through UV extinction curves by combining new HST/STIS optical spectrophotometry with existing IUE spectrophotometry (yielding gapless coverage from 1150 to 10000 Angstroms) and NIR photometry. These curves are used to dete
Externí odkaz:
http://arxiv.org/abs/1910.08852
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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