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Estimation of Nitrogen-to-Iron Abundance Ratios from Low-Resolution Spectra
Beers, Timothy C.; Lee, Young Sun; Masseron, Thomas +1 more
We present a method to determine nitrogen abundance ratios with respect to iron ([N/Fe]) from molecular CN-band features observed in low-resolution (R ∼ 2000) stellar spectra obtained by the Sloan Digital Sky Survey (SDSS) and the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). Various tests are carried out to check the systema…
Infrared Properties of OGLE4 Mira Variables in Our Galaxy
Suh, Kyung-Won
We investigate infrared properties of OGLE4 Mira variables in our Galaxy. For each object, we cross-identify the AllWISE, 2MASS, Gaia, and IRAS counterparts. We present various IR two-color diagrams (2CDs) and period-magnitude and period-color relations for the Mira variables. Generally, the Mira variables with longer periods are brighter in the I…
V608 Cassiopeiae: A W UMa-Type Eclipsing Binary with Two Possible Circumbinary Companions
Lee, Jae Woo; Park, Jang-Ho
We present the photometric properties of V608 Cas from detailed studies of light curves and eclipse timings. The light curve synthesis indicates that the eclipsing pair is an overcontact binary with parameters of ΔT = 155 K, q = 0.328, and f = 26%. We detected the third light ℓ_{3}, which corresponds to about 8% and 5% of the total systemic light …