Zobrazeno 1 - 10
of 257
pro vyhledávání: '"Covey, K"'
Autor:
Schwope, A., Kurpas, J., Baecke, P., Knauff, K., Stütz, L., Tubin-Arenas, D., Standke, A., Anderson, S. F., Bauer, F., Brandt, N., Covey, K., Demasi, S., Dwelly, T., Freund, S., Friedrich, S., Gänsicke, B. T., Maitra, C., Merloni, A., Munoz-Giraldo, D., Rodriguez, A., Salvato, M., Stassun, K., Stelzer, B., Strong, A., Morrison, S.
Publikováno v:
A&A 686, A110 (2024)
Aims. Compact white-dwarf binaries are selected from spectra obtained in the early SDSS-V plate program. A dedicated set of SDSS plate observations were carried out in the eFEDS field, providing spectroscopic classifications for a significant fractio
Externí odkaz:
http://arxiv.org/abs/2401.17304
Autor:
Núñez, Alejandro, Agüeros, M. A., Curtis, J. L., Covey, K. R., Douglas, S. T., Chu, S. R., DeLaurentiis, S., Wang, M., Drake, J. J.
Low-mass (< 1.2 Solar mass) main-sequence stars lose angular momentum over time, leading to a decrease in their magnetic activity. The details of this rotation-activity relation remain poorly understood. Using observations of members of the $\approx$
Externí odkaz:
http://arxiv.org/abs/2311.18690
Autor:
Zasowski, G., Cohen, R. E., Chojnowski, S. D., Santana, F., Oelkers, R. J., Andrews, B., Beaton, R. L., Bender, C., Bird, J. C., Bovy, J., Carlberg, J. K., Covey, K., Cunha, K., Dell’Agli, F., Fleming, Scott W., Frinchaboy, P. M., García-Hernández, D. A., Harding, P., Holtzman, J., Johnson, J. A., Kollmeier, J. A., Majewski, S. R., Mészáros, Sz., Munn, J., Muñoz, R. R., Ness, M. K., Nidever, D. L., Poleski, R., Román-Zúñiga, C., Shetrone, M., Simon, J. D., Smith, V. V., Sobeck, J. S., Stringfellow, G. S., Szigetiáros, L., Tayar, J., Troup, N.
APOGEE-2 is a high-resolution, near-infrared spectroscopic survey observing similar to 3. x. 10(5) stars across the entire sky. It is the successor to APOGEE and is part of the Sloan Digital Sky Survey IV (SDSS-IV). APOGEE-2 is expanding on APOGEE's
Externí odkaz:
http://hdl.handle.net/10150/626051
http://arizona.openrepository.com/arizona/handle/10150/626051
http://arizona.openrepository.com/arizona/handle/10150/626051
Autor:
Sprague, Dani, Culhane, Connor, Kounkel, Marina, Olney, Richard, Covey, K. R., Hutchinson, Brian, Lingg, Ryan, Stassun, Keivan G., Román-Zúñiga, Carlos G., Roman-Lopes, Alexandre, Nidever, David, Beaton, Rachael L., Borissova, Jura, Stutz, Amelia, Stringfellow, Guy S., Ramírez, Karla Peña, Ramírez-Preciado, Valeria, Hernández, Jesús, Kim, Jinyoung Serena, Lane, Richard R.
We train a convolutional neural network, APOGEE Net, to predict $T_\mathrm{eff}$, $\log g$, and, for some stars, [Fe/H], based on the APOGEE spectra. This is the first pipeline adapted for these data that is capable of estimating these parameters in
Externí odkaz:
http://arxiv.org/abs/2201.03661
Autor:
Miller, Annaliese, Kounkel, Marina, Sun, Meng, Dixon, Don, Boggio, Chase, Covey, K. R., Stassun, Keivan G., Mathieu, Robert
We present the orbital solution of a peculiar double-lined spectroscopic and eclipsing binary system, 2M17091769+3127589. This solution was obtained by a simultaneous fit of both APOGEE radial velocities and TESS and ASAS-SN light curves to determine
Externí odkaz:
http://arxiv.org/abs/2107.11393
Autor:
Medina, N., Borissova, J., Kurtev, R., Alonso-García, J., Román-Zúñiga, Carlos G., Bayo, A., Kounkel, Marina, Roman-Lopes, Alexandre, Lucas, P. W., Covey, K. R., Förster, Francisco, Minniti, Dante, Adame, Lucia, Hernández, Jesús
We present a catalog of 167 newly discovered, irregular variables spanning a $\sim$7 deg${^2}$ area that encompasses the G 305 star-forming complex, one of the most luminous giant H II regions in the Galaxy. We aim to unveil and characterize the youn
Externí odkaz:
http://arxiv.org/abs/2104.02200
AA Tau is a classical T Tauri star with a highly inclined, warped circumstellar disk. For decades, AA Tau exhibited photometric and spectroscopic variability that were successfully modelled as occultations of the primary star by circumstellar materia
Externí odkaz:
http://arxiv.org/abs/2012.02415
We present a sample of 14 M dwarf stars observed with XMM-Newton and Chandra, for which we also computed rotational periods from Kepler Two-Wheel (K2) Mission light curves. We compiled X-ray and rotation data from the literature and homogenized all d
Externí odkaz:
http://arxiv.org/abs/2004.02904
Autor:
Olney, Richard, Kounkel, Marina, Schillinger, Chad, Scoggins, Matthew T., Yin, Yichuan, Howard, Erin, Covey, K. R., Hutchinson, Brian, Stassun, Keivan G.
Machine learning allows efficient extraction of physical properties from stellar spectra that have been obtained by large surveys. The viability of ML approaches has been demonstrated for spectra covering a variety of wavelengths and spectral resolut
Externí odkaz:
http://arxiv.org/abs/2002.08390
Autor:
Galli, P. A. B., Loinard, L., Bouy, H., Sarro, L. M., Ortiz-León, G. N., Dzib, S. A., Olivares, J., Heyer, M., Hernandez, J., Román-Zúñiga, C., Kounkel, M., Covey, K.
Publikováno v:
A&A 630, A137 (2019)
Aims:We take advantage of the second data release of the Gaia space mission and the state-of-the-art astrometry delivered from very long baseline interferometry observations to revisit the structure and kinematics of the nearby Taurus star-forming re
Externí odkaz:
http://arxiv.org/abs/1909.01118