We report the spectroscopic detection of the secondary star in the x-ray transient QZ Vul (=GS 2000+25). Cross-correlation of individual spectra against K-type...
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PublicationDynamical evidence for a black hole in the x-ray transient QZ VUL (=GS 2000+25)
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PublicationEffect of atmospheric extinction on solar radial velocity measurements
Effects of differential extinction across the Earth's atmosphere on astronomical photometry are reviewed. Under the same circumstances when a rotating extended...
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PublicationEffects of interstellar absorptions on MG II chromospheric emissions
The Mg II chromospheric emissions in cool stars were analyzed using high resolution IUE archive spectra. The ways in which interstellar (IS) absorptions can...
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PublicationGeometry of the Draco C1 Symbiotic Binary
Draco C1 is a known symbiotic binary star system composed of a carbon red giant and a hot, compact companion—likely a white dwarf—belonging to the Draco dwarf...
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PublicationGlobal acoustic oscillations on Alpha Bootis
A two-week time series of precise radial velocity measurements of Alpha Bootis (Arcturus) covering 7-8 hr per night is reported. The radial barycentric velocity...
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PublicationH II region spectroscopy and two dimensional stellar photometry of the barred Seyfert NGC 1566
Radial velocities of 14 H II regions were obtained using reticon spectroscopy at H-alpha for the barred spiral NGC 1566. The same spectra also yield N II/H and...
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PublicationHyades Member K2-136c: The Smallest Planet in an Open Cluster with a Precisely Measured Mass
K2-136 is a late-K dwarf (0.742 ± 0.039 M ⊙) in the Hyades open cluster with three known, transiting planets and an age of 650 ± 70 Myr. Analyzing K2 photometry...
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NewsIAC scientists complete an unprecedented study of the masses of over 500 clusters of galaxies
A team of researchers from the cosmology group at the Instituto de Astrofísica de Canarias has obtained one of the most accurate measurements of the masses of...
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PublicationInfrared photometry of upper main sequence stars in M39
Infrared photometry of 19 Main sequence stars in the open cluster M39 is presented. Infrared-infrared and optical-infrared color-color and color-magnitude...