A new search for variable stars in the globular cluster NGC 6366 (2008)
Ferro, A. Arellano, Giridhar, Sunetra, Lopez, V. Rojas, Figuera, R., Bramich, D. M., Rosenzweig, P.
New CCD photometry of NGC 6366 has lead to the discovery of some variable stars. Two possible Anomalous Cepheids (or Pop II Cepheids), three long period variables, one SX Phe and one eclipsing binary...
Ferro, A. Arellano, Lopez, V. Rojas, Giridhar, Sunetra, Bramich, D. M.
We report the results of CCD V and r photometry of the globular cluster NGC 5466. The difference image analysis technique adopted in this work has resulted in accurate time series photometry even in...
The Chemical Compositions of the Type II Cepheids -- The BL Her and W Vir Variables (2007)
Maas, Thomas, Giridhar, Sunetra, Lambert, David L.
Abundance analyses from high-resolution optical spectra are presented for 19 Type II Cepheids in the Galactic field. The sample includes both short-period (BL Her) and long-period (W Vir) stars. This...
Joint discussion 13 exploiting large surveys for Galactic astronomy (2007)
Corbally, Christopher J., Giridhar, Sunetra, Lloyd Evans, Thomas H.
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Commission 45: stellar classification (2007)
Corbally, Christopher, Giridhar, Sunetra, Bailer-Jones, Coryn, Humphreys, Roberta, Kirkpatrick, Davy, Evans, Tom Lloyd, ...
This report, like its predecessors, focuses on areas which have been especially active since the last General Assembly. Two major developments have been the unification of the T-dwarf standards and...
Chemical composition of evolved stars of high galactic latitude (2005)
Giridhar, Sunetra, Ferro, A. Arellano
We have carried out abundance analysis for a sample of high galactic latitude supergiants in search of evolved stars. We find that HD 27381 has atmospheric parameters and an abundance pattern very...
Abundance Analyses of Field RV Tauri Stars, VI: An Extended Sample (2005)
Giridhar, Sunetra, Lambert, David L., Reddy, Bacham E., Gonzalez, Guillermo, Yong, David
An abundance analysis is presented and discussed for a sample of 14 RV Tauri stars. The present abundance data and those from our previous papers and by other workers are combined in an attempt to...
HD 34700: A new T Tauri double-lined spectroscopic binary (2003)
Ferro, A. Arellano, Giridhar, Sunetra
We find the star HD 34700 to be a double-lined spectroscopic binary. We also identify it as a weak-line T Tauri object The spectra of both components are very similar and both show the Li I feature...
Ferro, A. Arellano, Giridhar, Sunetra, Arellano, E. Rojo
A new calibration of the Mv-W(OI 7774) relationship has been calculated using better estimates of reddenings and distances to a sample of 27 calibrator stars of A-G spectral types, based on accurate...
Spectroscopic Survey of Field stars: A search for Metal-Poor stars (2002)
Giridhar, Sunetra, Goswami, Aruna
We have undertaken a spectroscopic survey of field stars to find metal-poor objects among them. Observations are carried out using OMR spectrograph attached to 2.3m telescope at VBO Kavalur, India....
Atmospheric Abundances in Post-AGB candidates of Intermediate Temperature (2001)
Ferro, A. Arellano, Giridhar, Sunetra, Mathias, P.
Detailed atmospheric abundances have been calculated for a sample of A-G supergiant stars with IR fluxes and/or high galactic latitudes. HD 172481 and HD 158616 show clear indications of being...
Chemical Compositions of Four Metal-poor Giants (2001)
Giridhar, Sunetra, Lambert, David L., Gonzalez, Guillermo, Pandey, Gajendra
We present the chemical compositions of four K giants CS 22877-1, CS 22166-16, CS22169-35 and BS 16085 - 0050 that have [Fe/H] in the range -2.4 to -3.1. Metal-poor stars with [Fe/H] < -2.5 are known...
Giridhar, Sunetra, Lambert, David L., Gonzalez, Guillermo
Abundance analyses are presented and discussed for eight RV Tauri variables. The RV B star UY Ara shows the abundance anomalies seen in other RV B stars, namely elements that condense into grains at...
Giridhar, Sunetra, Lambert, David L., Gonzalez, Guillermo
Chemical compositions are derived from high-resolution spectra for three stars classed as SRd variables in the General Catalogue of Variable Stars. These stars are shown to be metal-poor supergiants:...