Zobrazeno 1 - 10
of 225
pro vyhledávání: '"Kounkel, Marina"'
Two young eclipsing binaries in Orion with temperatures and radii affected by spots and third bodies
Autor:
Kounkel, Marina, Stassun, Keivan G.
In this work we present a model of two young eclipsing binaries in the Orion Complex. Both heavily spotted, they present radii and temperatures that are in disagreement with the predictions of standard stellar models. 2M05-06 consists of two stars wi
Externí odkaz:
http://arxiv.org/abs/2408.00886
Autor:
López-Valdivia, Ricardo, Adame, Lucía, Lagunas, Eduardo Zagala, Román-Zúñiga, Carlos G., Hernández, Jesús, Sánchez, Edilberto, Fernández-Trincado, José G., Carigi, Leticia, Kounkel, Marina, Lane, Richard R., Stassun, Keivan G., Villanova, Sandro
To date, we have access to enormous inventories of stellar spectra that allow the extraction of atmospheric parameters and chemical abundances essential in stellar studies. However, characterizing such a large amount of data is complex and requires a
Externí odkaz:
http://arxiv.org/abs/2407.17640
Autor:
Soares-Furtado, Melinda, Limbach, Mary Anne, Vanderburg, Andrew, Bally, John, Becker, Juliette, Rosen, Anna L., Bouma, Luke G., Vos, Johanna M., Howell, Steve B., Beatty, Thomas G., Best, William M. J., Cody, Anne Marie, Distler, Adam, D'Onghia, Elena, Heller, René, Hensley, Brandon S., Hinkel, Natalie R., Jackson, Brian, Kounkel, Marina, Kraus, Adam, Mann, Andrew W., Marston, Nicholas T., Robberto, Massimo, Rodriguez, Joseph E., Steffen, Jason H., Teske, Johanna K., Townsend, Richard, Yarza, Ricardo, Youngblood, Allison
The TEMPO (Transiting Exosatellites, Moons, and Planets in Orion) Survey is a proposed 30-day observational campaign using the Nancy Grace Roman Space Telescope. By providing deep, high-resolution, short-cadence infrared photometry of a dynamic star-
Externí odkaz:
http://arxiv.org/abs/2406.01492
Autor:
Stassun, Keivan G., Kounkel, Marina
We have assembled a sample of $\sim$8200 stars with spectral types F5V-M5V, all having directly measured X-ray luminosities from eROSITA and rotation periods from TESS, and having empirically estimated ages via their membership in stellar clusters an
Externí odkaz:
http://arxiv.org/abs/2405.08607
Publikováno v:
A&A 690, A272 (2024)
(Edited) Many fast rotator stars (rotation periods of < 2 days) are found in unresolved binaries with separations of tens of au. This correlation leads to the question of whether the formation of binary stars inherently produces fast rotators. We aim
Externí odkaz:
http://arxiv.org/abs/2404.14210
Autor:
Serna, Javier, Pinzón, Giovanni, Hernández, Jesús, Manzo-Martínez, Ezequiel, Mauco, Karina, Román-Zúñiga, Carlos G., Calvet, Nuria, Briceño, Cesar, López-Valdivia, Ricardo, Kounkel, Marina, Stringfellow, Guy S., Stassun, Keivan G., Pinsonneault, Marc, Adame, Lucia, Cao, Lyra, Covey, Kevin, Bayo, Amelia, Roman-Lopes, Alexandre, Nitschelm, Christian, Lane, Richard R.
We developed a grid of stellar rotation models for low-mass and solar-type Classical T Tauri stars (CTTS) ($0.3M_{\odot}
Externí odkaz:
http://arxiv.org/abs/2403.07505
Autor:
Sizemore, Logan, Llanes, Diego, Kounkel, Marina, Hutchinson, Brian, Stassun, Keivan G., Chandra, Vedant
Data-driven models, which apply machine learning to infer physical properties from large quantities of data, have become increasingly important for extracting stellar properties from spectra. In general, these methods have been applied to data in one
Externí odkaz:
http://arxiv.org/abs/2402.05184
Autor:
Ordóñez-Toro, Jazmín, Dzib, Sergio A., Loinard, Laurent, Ortiz-León, Gisela, Kounkel, Marina A., Masqué, Josep M., Medina, S. -N. X., Galli, Phillip A. B., Dupuy, Trent J., Rodríguez, Luis F., Quiroga-Nuñez, Luis H.
We report dynamical mass measurements of the individual stars in the most luminous and massive stellar member of the nearby Ophiuchus star-forming region, the young tight binary system S1. We combine 28 archival datasets with seven recent, proprietar
Externí odkaz:
http://arxiv.org/abs/2401.02885
Autor:
Saad, Serat, Lane, Kaitlyn, Kounkel, Marina, Stassun, Keivan G., López-Valdivia, Ricardo, Kim, Jinyoung Serena, Ramírez, Karla Peña, Stringfellow, Guy S., Román-Zúñiga, Carlos G., Hernández, Jesús, Wolk, Scott J., Hillenbrand, Lynne A.
We developed a tool that measures equivalent widths of various lines in low resolution optical spectra, and it was applied to stellar spectra obtained as part of SDSS-V and LAMOST programs. These lines, such as Li I which directly indicates stellar y
Externí odkaz:
http://arxiv.org/abs/2401.01932
Autor:
Corrales, Lia, Stassun, Keivan G., Cunningham, Tim, Duvvuri, Girish, Drake, Jeremy J., Espaillat, Catherine, Feinstein, Adina D., Gallo, Elena, Gunther, Hans Moritz, King, George W., Kounkel, Marina, Lisse, Carey M., Montez Jr., Rodolfo, Principe, David A., Toala, Jesus A., Wolk, Scott J., Cilley, Raven, Daylan, Tansu, Karovska, Margarita, Pradhan, Pragati, Wheatley, Peter J., Yang, Jun
One of the key research themes identified by the Astro2020 decadal survey is Worlds and Suns in Context. The Advanced X-ray Imaging Satellite (AXIS) is a proposed NASA APEX mission that will become the prime high-energy instrument for studying star-p
Externí odkaz:
http://arxiv.org/abs/2311.07674