758 citations · 3.4k across the 65 of their papers we have counts for
23 papers · 1 filter
The Chemical Enrichment History of the Magellanic Clouds Field Populations
R. Carrera, C. Gallart, A. Aparicio +5
We report the results of our project devoted to study the chemical enrichment history of the field population in the Magellanic Clouds using Ca II triplet spectroscopy.
The vertical velocity dispersion profile of the Galactic thick disk
C. Moni Bidin, T. M. Girard, G. Carraro +4
We present the results of radial velocity measurements of 770 thick disk red giants toward the South Galactic Pole, vertically distributed from 0.5 kpc to 5 kpc with respect to the…
Proper Motions in the Galactic Bulge: Plaut's Window
Katherine Vieira, Dana I. Casetti-Dinescu, Rene A. Mendez +6
A proper motion study of a field of 20' x 20' inside Plaut's low extinction window (l,b)=(0 deg,-8 deg), has been completed. Relative proper motions and photographic BV photometry…
Old Main-Sequence Turnoff Photometry in the Small Magellanic Cloud. I. Constraints on the Star Formation History in Different Fields
Noelia E. D. Noel, Carme Gallart, Edgardo Costa +1
We present ground-based B and R-band color-magnitude diagrams (CMDs), reaching the oldest main-sequence turnoffs with good photometric accuracy for twelve fields in the Small Magel…
The Star Formation History in a SMC field: IAC-star/IAC-pop at work
Noelia E. D. Noel, Antonio Aparicio, Carme Gallart +3
We present a progress report of a project to study the quantitative star formation history (SFH) in different parts of the Small Magellanic Cloud (SMC). We use the information in […
WIYN Open Cluster Study. XXVI. Improved kinematic membership and spectroscopy of IC 2391
I. Platais, C. Melo, J. -C. Mermilliod +5
[Abridged] Contex. Young open clusters provide important clues to the interface between the main sequence and pre-main-sequence phases of stellar evolution. The young and nearby op…
The Solar Neighborhood XVII: Parallax Results from the CTIOPI 0.9m Program -- Twenty New Members of the RECONS 10 Parsec Sample
Todd J. Henry, Wei-Chun Jao, John P. Subasavage +4
Astrometric measurements for 25 red dwarf systems are presented, including the first definitive trigonometric parallaxes for 20 systems within 10 pc of the Sun, the horizon of the…
Photometry of seven overlooked open clusters in the First and Fourth Galactic Quadrants
Giovanni Carraro, Kenneth A. Janes, Edgardo Costa +1
CCD BVI photometry is presented for 7 previously unstudied star clusters projected toward the inner side of the Galaxy: Trumpler 23, Lynga 3, Collinder 307, Ruprecht 134, ESO552SC1…
The Proper Motion of the Large Magellanic Cloud: A Reanalysis
Mario H. Pedreros, Edgardo Costa, Rene A. Mendez
We have determined the proper motion (PM) of the Large Magellanic Cloud (LMC) relative to four background quasi-stellar objects, combining data from two previous studies made by ou…
Spectroscopic search for binaries among EHB stars in globular clusters
C. Moni Bidin, R. A. Mendez, S. Moehler +3
We performed a spectroscopic search for binaries among hot Horizontal Branch stars in globular clusters. We present final results for a sample of 51 stars in NGC6752, and prelimina…
Spectroscopy of QUEST RR Lyrae Variables: the new Virgo Stellar Stream
Sonia Duffau, Robert Zinn, A. Katherina Vivas +4
Eighteen RR Lyrae variables (RRLs) that lie in the "$12\fh 4$ clump" identified by the QUEST survey have been observed spectroscopically to measure their radial velocities and meta…
SMC: Stellar Populations through deep CMDs
Noelia E. D. Noel, Carme Gallart, Edgardo Costa +1
We present deep color-magnitud diagrams (CMDs) reaching the oldest main-sequence turnoffs for 12 fields in the SMC. The {\it B}-band and {\it R}-band observations were performed us…
The open cluster NGC 6520 and the nearby dark molecular cloud Barnard 86
Giovanni Carraro, Rene Mendez, Jorge May +1
Wide field BVI photometry and CO(10) observations are presen ted in the region of the open cluster NGC 6520 and the dark molecular cloud Barnard~86. From the analysis o…
NGC 6404 and NGC 6583: two neglected intermediate-age open clusters located in the Galactic Center direction
Giovanni Carraro, Rene Mendez, Edgardo Costa
We report on CCD photometry of two fields centered in the region of the open clusters NGC 6404 and NGC 6583 down to . These clusters have never been studied insofar, a…
Absolute Proper Motions to B~22.5: V. Detection of Sagittarius Dwarf Spheroidal Debris in the Direction of the Galactic Anticenter
Dana I. Dinescu, Steven R. Majewski, Terrence M. Girard +6
We have detected a population of predominantly blue (B-V <= 1.1) stars in the direction l = 167 deg., b = -35 deg. (Kapteyn Selected Area 71) that cannot be accounted for by standa…
The Luminosity Function of Magnitude and Proper-Motion Selected Samples. The case of White-Dwarfs
Rene A. Mendez, Maria T. Ruiz
The luminosity function of white dwarfs is a powerful tool for studies of the evolution and formation of the Milky Way. The (theoretical) white dwarf cooling sequence provides a us…
The interplay of observational errors through numerical simulations using the method for magnitude and proper-motion samples of local disk white dwarfs.}
Rene A. Mendez, Maria T. Ruiz
White dwarf cooling sequences provides a useful indicator of the evolutionary time scales involved in the chronometry and star formation history of the galactic disk and, for this…
Galactic Kinematics Towards the South Galactic Pole. First Results from the Yale-San Juan Southern Proper-Motion Program
René A. Méndez, Imants Platais, Terrence M. Girard +2
The predictions from a Galactic Structure and Kinematic model code are compared to the color counts and absolute proper-motions derived from the Southern Proper-Motion survey cover…
BVRI Light Curves for 22 Type Ia Supernovae
Adam G. Riess, Robert P. Kirshner, Brian P. Schmidt +6
We present 1210 Johnson/Cousins B,V,R, and I photometric observations of 22 recent type Ia supernovae (SNe Ia): SN 1993ac, SN 1993ae, SN 1994M, SN 1994S, SN 1994T, SN 1994Q, SN 199…
BVRI Light Curves for 29 Type Ia Supernovae
Mario Hamuy, M. M. Phillips, Nicholas B. Suntzeff +2
BVRI light curves are presented for 27 Type Ia supernovae discovered during the course of the Calan/Tololo Survey and for two other SNe Ia observed during the same period. Estimate…
Galactic structure towards the Open Clusters NGC 188 and NGC 3680
R. A. Mendez, W. F van Altena
We present the first comparisons of a newly developed Galactic Structure and Kinematic Model to magnitude and color counts, as well as relative proper motions, in the fields of the…
A Large Proper-Motion Survey in Plaut's Low-Extinction Window
R. A. Mendez, R. M. Rich, W. F van Altena +3
We present preliminary results from the deepest and largest photographic proper-motion survey ever undertaken of the Galactic bulge. Our first-epoch plate material (from 1972-3) go…
Starcounts in the Hubble Deep Field: Constraining Galactic Structure Models
R. A. Mendez, D. Minniti, G. de Marchi +2
Stellar sources are identified in the Hubble Deep Field, and accurate colours and magnitudes are presented. The predictions of a Galactic starcounts model are compared with the fai…