Philip Massey, Reagin T. Mcneill, Paul W. Hodge, George H. Jacoby, R. C. Smith, ...
We describe a search for Hα emission-lined stars in M31, M33, and seven dwarfs in or near the Local Group (IC 10, NGC 6822, WLM, Sextans B, Sextans A, Pegasus and the Phoenix dwarf) using...
Yellow Supergiants in the Andromeda Galaxy (M31) (2009)
Drout, Maria R., Massey, Philip, Meynet, Georges, Tokarz, Susan, Caldwell, Nelson
The yellow supergiant content of nearby galaxies can provide a critical test of stellar evolution theory, bridging the gap between the hot, massive stars and the cool red supergiants. But, this...
Red Supergiants in the Andromeda Galaxy (M31) (2009)
Massey, Philip, Silva, David R., Levesque, Emily M., Plez, Bertrand, Olsen, Knut A. G., Clayton, Geoffrey C., ...
Red supergiants are a short-lived stage in the evolution of moderately massive stars (10-25Mo), and as such their location in the H-R diagram provides an exacting test of stellar evolutionary models....
The Physical Properties of the Red Supergiant WOH G64: The Largest Star Known? (2009)
Levesque, Emily M., Massey, Philip, Plez, Bertrand, Olsen, Knut A. G.
WOH G64 is an unusual red supergiant (RSG) in the Large Magellanic Cloud (LMC), with a number of properties that set it apart from the rest of the LMC RSG population, including a thick circumstellar...
When we look at a nearby galaxy, we see a mixture of foreground stars and bona fide extragalactic stars. I will describe what we need to do to get meaningful statistics on the massive star...
Young stellar clusters and star formation throughout the Galaxy (2009)
Feigelson, Eric, Adams, Fred, Allen, Lori, Bergin, Edwin, Bally, John, Balog, Zoltan, ...
Most stars are born in rich young stellar clusters (YSCs) embedded in giant molecular clouds. The most massive stars live out their short lives there, profoundly influencing their natal environments...
Massey, Philip, Zangari, Amanda M., Morrell, Nidia I., Puls, Joachim, DeGioia-Eastwood, Kathleen, Bresolin, Fabio, ...
In order to better determine the physical properties of hot, massive stars as a function of metallicity, we obtained very high SNR optical spectra of 26 O and early B stars in the Magellanic Clouds....
The Physical Properties of Red Supergiants: Comparing Theory and Observations (2008)
Massey, Philip, Levesque, Emily M., Plez, Bertrand, Olsen, K. A. G.
Red supergiants (RSGs) are an evolved stage in the life of intermediate massive stars (than than 25 solar masses). For many years, their location in the H-R diagram was at variance with the...
The Massive Star Content of NGC 3603 (2007)
Melena, Nicholas W., Massey, Philip, Morrell, Nidia I., Zangari, Amanda M.
We investigate the massive star content of NGC 3603, the closest known giant H II region. We have obtained spectra of 26 stars in the central cluster using the Baade 6.5-m telescope (Magellan I). Of...
Massey, Philip, McNill, Reagin T., Olsen, K. A. G., Hodge, Paul W., Blaha, Cynthia, Jacoby, George H., ...
We describe a search for H-alpha emission-lined stars in M31, M33, and seven dwarfs in or near the Local Group (IC 10, NGC 6822, WLM, Sextans B, Sextans A, Pegasus and the Phoenix dwarf) using...
Physical Properties of Red Supergiants (2007)
Massey, Philip, Plez, Bertrand, Levesque, Emily M., Olsen, K. A. G., Silva, David R., Clayton, Geoffery C.
Red supergiants (RSGs) are an evolved stage in the life of intermediate massive stars (
The Coolest Stars in the Clouds: Unusual Red Supergiants in the Magellanic Clouds (2007)
Levesque, Emily M., Massey, Philip, Olsen, K. A. G., Plez, Bertrand
Red supergiants (RSGs) are a He-burning phase in the evolution of moderately high mass stars (10-25 solar masses). The evolution of these stars, particularly at low metallicities, is still poorly...
Late-Type Red Supergiants: Too Cool for the Magellanic Clouds? (2007)
Levesque, Emily M., Massey, Philip, Olsen, K. A. G., Plez, Bertrand
We have identified seven red supergiants (RSGs) in the Large Magellanic Cloud (LMC) and four RSGs in the Small Magellanic Cloud (SMC), all of which have spectral types that are considerably later...
Massey, Philip, Olsen, K. A. G., Hodge, Paul W., Jacoby, George H., McNeill, Reagin T., Smith, R. C, ...
We have obtained UBVRI images with the Kitt Peak and Cerro Tololo 4-m telescopes and Mosaic cameras of seven dwarfs in (or near) the Local Group, all of which have known evidence of recent star...
HV 11423: The Coolest Supergiant in the SMC (2007)
Massey, Philip, Levesque, Emily M., Olsen, K. A. G., Plez, Bertrand, Skiff, B. A.
We call attention to the fact that one of the brightest red supergiants in the SMC has recently changed its spectral type from K0-1 I (December 2004) to M4 I (December 2005) and back to K0-1 I...
Evidence for Tidal Effects in the Stellar Dynamics of the Large Magellanic Cloud (2007)
Olsen, Knut A. G., Massey, Philip
We present a combined analysis of the kinematics of the Large Magellanic Cloud through its HI gas, carbon stars, and red supergiant stars. After correcting the line-of-sight velocities for the recent...
Bringing VY Canis Majoris Down to Size: An Improved Determination of Its Effective Tempeature (2006)
Massey, Philip, Levesque, Emily M., Plez, Bertrand
The star VY CMa is a late-type M supergiant with many peculiarities, mostly related to the intense circumstellar environment due to the star's high mass-loss rate. Claims have been made that would...
Olsen, Knut A. G., Blum, Robert D., Stephens, Andrew W., Davidge, Tim J., Massey, Philip, Strom, Stephen E., ...
We discuss H and K observations of three fields in the bulge and disk of M31 obtained with the Altair adaptive optics system and NIRI instrument on Gemini North. These are the highest resolution and...
Levesque, Emily M., Massey, Philip, Olsen, K. A. G., Plez, Bertrand, Meynet, George, Maeder, Andre
We use the MARCS stellar atmosphere to derive the physical properties of 36 red supergiants (RSGs) in the LMC, and 39 RSGs in the SMC using moderate-resolution optical spectrophotometry (4000-9000A)...
Massey, Philip, Olsen, K. A. G., Hodge, Paul W., Strong, Shay B., Jacoby, George H., Schlingman, Wayne, ...
We present UBVRI photometry obtained from Mosaic images of M31 and M33 using the KPNO 4-m telescope. The survey covers 2.2 sq degrees of M31, and 0.8 sq degrees of M33, chosen so as to include all of...
The Discovery of a P Cygni Analog in M31 (2006)
We present spectroscopy and discuss the photometric history of a previously obscure star in M31. The spectrum of the star is an extremely close match to that of P Cygni, one of the archetypes of...
The Reddening of Red Supergiants: When Smoke Gets In Your Eyes (2005)
Massey, Philip, Plez, Bertrand, Levesque, Emily M., Olsen, K. A. G., Clayton, Geoffrey, Josselin, Eric
Deriving the physical properties of red supergiants (RSGs) depends upon accurate corrections for reddening by dust. We use our recent modeling of the optical spectra of RSGs to address this topic. We...
Levesque, Emily M., Massey, Philip, Olsen, K. A. G., Plez, Bertrand, Josselin, Eric, Maeder, Andre, ...
We use moderate-resolution optical spectrophotometry and the new MARCS stellar atmosphere models to determine the effective temperatures of 74 Galactic red supergiants. From these we find a new...
Massey, Philip, Puls, Joachim, Pauldrach, A. W. A., Bresolin, Fabio, Kudritzki, Rolf P., Simon, Theodore
We analyze the optical and UV spectra of an additional sample of 20 Magellanic Cloud O stars, and draw conclusions from the complete sample of 40 stars. We find (1) The SMC O3-7 dwarfs are about 4000...
The Distance and Metallicity of the Newly Discovered, Nearby Irregular Galaxy HIZSS3 (2005)
Silva, David R., Massey, Philip, DeGioia-Eastwood, Kathleen, Henning, P. A.
HIZSS3 is an H I source in the Zone of Avoidance. Its radio characteristics are consistent with it being nearby (~ 1.8 Mpc) low-mass dwarf irregular (dIm) galaxy. It contains a modest H II region,...
A CNO Dichotomy among O2 Giant Spectra in the Magellanic Clouds (2004)
Walborn, Nolan R., Morrell, Nidia I., Howarth, Ian D., Crowther, Paul A., Lennon, Daniel J., Massey, Philip, ...
From a survey of the 3400 A region in the earliest O-type spectra, we have found that two of the four O2 giants observed in the LMC have the OIV lines there stronger than the NIV, while the other two...
Massey, Philip, Bresolin, Fabio, Kudritzki, Rolf P., Puls, Joachim, Pauldrach, A. W. A.
We have obtained HST and ground-based observations of a sample of 20 O-type stars in the LMC and SMC, including six of the hottest massive stars known (subtypes O2-3) in the R136 cluster. In general,...
The Ofpe/WN9 stars in M33 (2003)
Bianchi, Luciana, Bohlin, Ralph, Massey, Philip
We present HST/STIS Ultraviolet spectra of the six known Ofpe/WN9 stars (``slash stars'') in M33. These stars were selected for showing the characteristics of the Ofpe/WN9 class from previous optical...
The Evolution of Massive Stars. I. Red Supergiants in the Magellanic Clouds (2003)
Massey, Philip, Olsen, K. A. G.
We investigate the red supergiant (RSG) content of the SMC and LMC using multi-object spectroscopy on a sample of red stars previously identified by {\it BVR} CCD photometry. We obtained high...
The Discovery of a Twelfth Wolf-Rayet Star in the Small Magellanic Cloud (2003)
Massey, Philip, Olsen, K. A. G., Parker, J. Wm.
We report the discovery of a relatively faint (V=15.5) early-type WN star in the SMC. The line strength and width of He II lambda 4686 emission is similar to that of the other SMC WNs, and the...
A Neighboring Dwarf Irregular Galaxy Hidden by the Milky Way (2003)
Massey, Philip, Henning, P. A., Kraan-Korteweg, R. C.
We have obtained VLA and optical follow-up observations of the low-velocity H I source HIZSS 3 discovered by Henning et al. (2000) and Rivers (2000) in a survey for nearby galaxies hidden by the disk...
Massive Stars in the Local Group: Star Formation and Stellar Evolution (2003)
The galaxies of the Local Group that are currently forming stars can serve as our laboratories for understanding star formation and the evolution of massive stars. In this talk I will summarize what...
Wolf-Rayets in IC10: Probing the Nearest Starburst (2002)
Massey, Philip, Holmes, Shadrian
IC10 is the nearest starburst galaxy, as revealed both by its Halpha surface brightness and the large number of Wolf-Rayet stars (WRs) per unit area. The relative number of known WC- to WN-type WRs...
The Star Formation History and Mass Function of the Double Cluster h and Chi Persei (2002)
Slesnick, Catherine L., Hillenbrand, Lynne A., Massey, Philip
The h and Chi Per "double cluster" is examined using wide-field (0.98 deg x 0.98 deg) CCD UBV imaging supplemented by optical spectra of several hundred of the brightest stars. Restricting our...
Zaritsky, Dennis, Harris, Jason, Thompson, Ian B., Grebel, Eva K., Massey, Philip
We present our catalog of U, B, V, and I stellar photometry of the central 18 sq. degree area of the Small Magellanic Cloud. We combine our data with the 2MASS and DENIS catalogs to provide, when...
A UBVR CCD Survey of the Magellanic Clouds (2001)
We present photometry and a preliminary interpretation of a UBVR survey of the Large and Small Magellanic Clouds. We determine improved values for the relative number of blue and red supergiants. We...
Orbits of Four Very Massive Binaries in the R136 Cluster (2001)
Massey, Philip, Penny, Laura R., Vukovich, Julia
We present radial velocity and photometry for four early-type, massive double-lined spectroscopic binaries in the R136 cluster. Three of these systems are eclipsing, allowing orbital inclinations to...
Massey, Philip, Waterhouse, Elizabeth, DeGioia-Eastwood, Kathleen
We combine new CCD UBV photometry and spectroscopy with that from the literature to investigate 19 Magellanic Cloud OB associations that contain Wolf-Rayet (WR) and other types of evolved massive...
An expert system for a legal office (1995)
Includes bibliographical references (leaves 40-41)
Hays, Sharon L., Firmenich, Antoine A., Massey, Philip, Banerjee, Ronadip, Berg, Paul
The RFA1 gene encodes the large subunit of the yeast trimeric single-stranded DNA binding protein replication protein A (RPA), which is known to play a critical role in DNA replication. A...
Hays, Sharon L., Firmenich, Antoine A., Massey, Philip, Banerjee, Ronadip, Berg, Paul
The RFA1 gene encodes the large subunit of the yeast trimeric single-stranded DNA binding protein replication protein A (RPA), which is known to play a critical role in DNA replication. A...