Search Results - "Humphreys, Roberta M."

ON THE SOCIAL TRAITS OF LUMINOUS BLUE VARIABLES by Humphreys, Roberta M., Weis, Kerstin, Davidson, Kris, Gordon, Michael S.

“…ABSTRACT In a recent paper, Smith & Tombleson state that the luminous blue variables (LBVs) in the Milky Way and the Magellanic Clouds are isolated; they are…”
Get full text

A Census of the Most Luminous Stars. I. The Upper HR Diagram for the Large Magellanic Cloud by Martin, John C., Humphreys, Roberta M.

“…Abstract Spectral classification and multiwavelength photometry for the most luminous stars in the LMC has greatly increased due to several recent surveys for…”
Get full text

Yellow Supergiants and Post-red Supergiant Evolution in the Large Magellanic Cloud by Humphreys, Roberta M., Jones, Terry J., Martin, John C.

“…Abstract The empirical evidence for an upper-mass limit for the red supergiant (RSG) progenitors of the Type II-P SNe at about 18 MSun, raises questions about…”
Get full text

LUMINOUS AND VARIABLE STARS IN M31 AND M33. III. THE YELLOW AND RED SUPERGIANTS AND POST-RED SUPERGIANT EVOLUTION by Gordon, Michael S, Humphreys, Roberta M, Jones, Terry J

“…ABSTRACT Recent supernova (SN) and transient surveys have revealed an increasing number of non-terminal stellar eruptions. Though the progenitor class of these…”
Get full text

Eta Carinae’s Declining Outflow Seen in the UV, 2002–2015 by Davidson, Kris, Ishibashi, Kazunori, Martin, John C., Humphreys, Roberta M.

“…Abstract Existing Hubble Space Telescope UV data offer many previously neglected clues to η Car’s behavior since 2000. Here we examine a subset of observations…”
Get full text

The Hidden Clumps in VY CMa Uncovered by the Atacama Large Millimeter/submillimeter Array by Humphreys, Roberta M., Richards, A. M. S., Davidson, Kris, Singh, A. P., Decin, L., Ziurys, L. M.

“…Abstract The red hypergiant VY CMa is famous for its very visible record of high-mass-loss events. Recent CO observations with the Atacama Large…”
Get full text

The Complex Upper HR Diagram by Humphreys, Roberta M.

“…Several decades of observations of the most massive and most luminous stars have revealed a complex upper HR Diagram, shaped by mass loss, and inhabited by a…”
Get full text

THE UNUSUAL TEMPORAL AND SPECTRAL EVOLUTION OF SN2011ht. II. PECULIAR TYPE IIn OR IMPOSTOR? by HUMPHREYS, Roberta M, DAVIDSON, Kris, JONES, Terry J, POGGE, R. W, GRAMMER, Skyler H, PRIETO, José L, PRITCHARD, T. A

“…SN2011ht has been described both as a true supernova (SN) and as an impostor. In this paper, we conclude that it does not match some basic expectations for a…”
Get full text

SECULAR CHANGES IN ETA CARINAE'S WIND 1998―2011 by MEHNER, Andrea, DAVIDSON, Kris, HUMPHREYS, Roberta M, ISHIBASHI, Kazunori, MARTIN, John C, TERESA RUIZ, María, WALTER, Frederick M

“…Stellar wind-emission features in the spectrum of eta Carinae have decreased by factors of 1.5-3 relative to the continuum within the last 10 years. We…”
Get full text

ETA CARINAE AND ITS ENVIRONMENT by Davidson, Kris, Humphreys, Roberta M

“…Eta Carinae (Eta) is one of the most remarkable of all well-studied stars and perhaps the most poorly understood. Observations with the Hubble Space Telescope…”
Get full text

The Photometric and Spectral Evolution of the 2008 Luminous Optical Transient in NGC 300 by Humphreys, Roberta M, Bond, Howard E, Bedin, Luigi R, Bonanos, Alceste Z, Davidson, Kris, Berto Monard, L. A. G, Prieto, José L, Walter, Frederick M

“…The 2008 optical transient in NGC 300 is one of a growing class of intermediate-luminosity transients that brighten several orders of magnitude from a…”
Get full text

Episodic Gaseous Outflows and Mass Loss from Red Supergiants by Humphreys, Roberta M., Jones, Terry J.

“…Abstract The red hypergiant VY CMa and the more typical red supergiant (RSG) Betelgeuse provide clear observational evidence for discrete, directed gaseous…”
Get full text

RECOVERY FROM GIANT ERUPTIONS IN VERY MASSIVE STARS by Kashi, Amit, Davidson, Kris, Humphreys, Roberta M.

“…ABSTRACT We use a hydro-and-radiative-transfer code to explore the behavior of a very massive star (VMS) after a giant eruption-i.e., following a supernova…”
Get full text

Luminous and Variable Stars in M31 and M33. IV. Luminous Blue Variables, Candidate LBVs, B[e] Supergiants, and the Warm Hypergiants: How to Tell Them Apart by Humphreys, Roberta M., Gordon, Michael S., Martin, John C., Weis, Kerstin, Hahn, David

“…Abstract In this series of papers we have presented the results of a spectroscopic survey of luminous stars in the nearby spirals M31 and M33. Here, we present…”
Get full text

LUMINOUS AND VARIABLE STARS IN M31 AND M33. II. LUMINOUS BLUE VARIABLES, CANDIDATE LBVs, Fe II EMISSION LINE STARS, AND OTHER SUPERGIANTS by Humphreys, Roberta M, Weis, Kerstin, Davidson, Kris, Romans, D J, Burggraf, Birgitta

“…An increasing number of non-terminal eruptions are being found in the numerous surveys for optical transients. Very little is known about these giant…”
Get full text

Luminous and Variable Stars in M31 and M33. V. The Upper HR Diagram by Humphreys, Roberta M., Davidson, Kris, Hahn, David, Martin, John C., Weis, Kerstin

“…We present HR diagrams for the massive star populations in M31 and M33, including several different types of emission-line stars: the confirmed luminous blue…”
Get full text

High-excitation Emission Lines near Eta Carinae, and Its Likely Companion Star by Mehner, Andrea, Davidson, Kris, Ferland, Gary J, Humphreys, Roberta M

“…In order to study the distribution of gas and ionizing radiation around eta Car and their implications for its likely companion star, we have examined…”
Get full text

LUMINOUS AND VARIABLE STARS IN M31 AND M33. I. THE WARM HYPERGIANTS AND POST-RED SUPERGIANT EVOLUTION by Humphreys, Roberta M, Davidson, Kris, Grammer, Skyler, Kneeland, Nathan, Martin, John C, Weis, Kerstin, Burggraf, Birgitta

“…The progenitors of Type IIP supernovae (SNe) have an apparent upper limit to their initial masses of about 20 M sub([middot in circle]), suggesting that the…”
Get full text

A Tale of Two Impostors: SN2002kg and SN1954J in NGC 2403 by Humphreys, Roberta M., Davidson, Kris, Van Dyk, Schuyler D., Gordon, Michael S.

“…Abstract We describe new results on two supernova impostors in NGC 2403, SN 1954J(V12) and SN 2002kg(V37). For the famous object SN 1954J, we combine four…”
Get full text

The Great Eruption of η Carinae by Davidson, Kris, Humphreys, Roberta M.

“…Arising from A. Rest et al. Nature482, 375–378 (2012).10.1038/nature10775 During the years 1838–1858, the very massive star η Carinae became the prototype…”
Get full text