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Mostrando ítems 1-10 de 21

The lithium-rotation connection in the newly discovered young stellar stream Psc-Eri (Meingast 1)

Bayo, Amelia; Arancibia Silva (European Southern Observatory, 2020)

Context. As a fragile element, lithium is a sensitive probe of physical processes occurring in stellar interiors. Aims. We aim to investigate the relationship between lithium abundance and rotation rate in low-mass members ...

Line identification in high-resolution, near-infrared CRIRES spectra of chemically peculiar and Herbig Ae stars

Hubrig, S.; Castelli, F.; Gonzalez, Jorge Federico; Elkin, V. G.; Mathys, G.; Cowley, C. R.; Wolff, B.; Schöller, M. (EDP Sciences, 2012-06)

Context. Contrary to the late-type stars, our knowledge of atomic transitions in intermediate-mass stars is still very poor. The recent availability of ESO's high-resolution spectrograph CRIRES offers now the opportunity ...

The spectral type of CHS 7797 - an intriguing very low mass periodic variable in the Orion Nebula Cluster

Rodriguez Ledesma, María V.; Mundt, Reinhard; Pintado, Olga Ines; Boudreault, Steve; Hessman, Frederic; Herbst, William (EDP Sciences, 2013-02)

Aims: We present the spectroscopic characterization of the unusual high-amplitude very low mass pre-main-sequence periodic variable CHS 7797. Methods: This study is based on optical medium-resolution (R = 2200) spectroscopy ...

The effect of ISM absorption on stellar activity measurements and its relevance for exoplanet studies

Fossati, L.; Marcelja, S. E.; Staab, D.; Cubillos, P. E.; France, K.; Haswell, C. A.; Ingrassia, S.; Jenkins, James Stewart; Koskinen, T.; Lanza, A. F.; Redfield, S.; Youngblood, A.; Pelzmann, G. (EDP Sciences, 2017-05)

Past ultraviolet and optical observations of stars hosting close-in Jupiter-mass planets have shown that some of these stars present an anomalously low chromospheric activity, significantly below the basal level. For the ...

The Gaia-ESO Survey: Sodium and aluminium abundances in giants and dwarfs Implications for stellar and Galactic chemical evolution

Smiljanic, R.; Romano, D.; Bragaglia, A.; Donati, P.; Magrini, L.; Friel, E.; Jacobson, H.; Randich, S.; Ventura, P.; Lind, K.; Bergemann, M.; Nordlander, T.; Morel, T.; Pancino, E.; Tautvaisiene, G.; Adibekyan, V.; Tosi, M.; Vallenari, A.; Gilmore, G.; Bensby, T.; Francois, P.; Koposov, S.; Lanzafame, A. C.; Recio Blanco, A.; Bayo, A.; Carraro, G.; Casey, A. R.; Costado, M. T.; Franciosini, E.; Heiter, U.; Hill, V.; Hourihane, A.; Jofre, P.; Lardo, C.; de Laverny, P.; Lewis, J.; Monaco, L.; Morbidelli, L.; Sacco, G. G.; Sbordone, L.; Sousa, S. G.; Worley, C. C.; Zaggia, S. (EDP SCIENCES S A, 2016)

Context. Stellar evolution models predict that internal mixing should cause some sodium overabundance at the surface of red giants more massive than similar to 1.5-2.0 M-circle dot. The surface aluminium abundance should ...

TOI-677b: A Warm Jupiter (P = 11.2 days) on an Eccentric Orbit Transiting a Late F-type Star.

Jordán, Andrés; Brahm Scott, Rafael

We report the discovery of TOI-677 b, first identified as a candidate in light curves obtained within Sectors 9 and 10 of the Transiting Exoplanet Survey Satellite (TESS) mission and confirmed with radial velocities. TOI-677 ...

Estudio de variaciones en los tiempos de mínimo en estrellas con planetas transitantes del Hemisferio Sur

Petrucci, Romina Paola (2015-03)

En este trabajo presentamos los resultados del monitoreo y análisis homogéneo de tránsitos de planetas que orbitan alrededor de estrellas del Hemisferio Sur. El propósito principal de este seguimiento fotométrico es el de ...

Radial Velocity Survey for Planets around Young stars (RVSPY) : Target characterisation and high-cadence survey

Zakhozhay, Olga V.; Launhardt, Ralf; Müller, Andre; Eigenthaler, Paul; Hempel, Angela; Hempel, Maren; Henning, Thomas; Kim, Sam; Kurster, Martin; Lachaume, Régis; Manerikar, Yashodham; Pavlov, Alexey; Trifonov, Trifonov; Brems, Stefan S.; Reffert, Sabine; Gennaro, Mario; Kennedy G.M.; Patel, Jayshil A. (EDP Sciences, 2022)

Context. The occurrence rate and period distribution of (giant) planets around young stars is still not as well constrained as for older main-sequence stars. This is mostly due to the intrinsic activity-related complications ...

NGTS clusters survey – I. Rotation in the young benchmark open cluster Blanco 1

Gillen, Edward; Briegal, Joshua T.; Hodgkin, Simon T.; Foreman-Mackey, Daniel; Van Leeuwen, Floor; Jackman, James A. G.; McCormac, James; West, Richard G.; Queloz, Didier; Bayliss, Daniel; Goad, Michael R.; Watson, Christopher A.; Wheatley, Peter J.; Belardi, Claudia; Burleigh, Matthew R.; Casewell, Sarah L.; Jenkins, James S.; Raynard, Liam; Smith, Alexis M. S.; Tilbrook, Rosanna H.; Vines, José I. (Oxford Unv Press, 2020)

We determine rotation periods for 127 stars in the similar to 115-Myr-old Blanco 1 open cluster using similar to 200 d of photometric monitoring with the Next Generation Transit Survey. These stars span F5-M3 spectral types ...

Molecular Gas Properties on Cloud Scales across the Local Star-forming Galaxy Population

Sun, Jiayi; Leroy, Adam K.; Schinnerer, Eva; Hughes, Annie; Rosolowsky, Erik; Querejeta, Miguel; Schruba, Andreas; Liu, Daizhong; Saito, Toshiki; Herrera, Cinthya N.; Faesi, Christopher; Usero, Antonio; Pety, Jérôme; Kruijssen, J. M. Diederik; Ostriker, Eve C.; Bigiel, Frank; Blanc Mendiberri, Guillermo; Bolatto, Alberto D.; Boquien, Médéric; Chevance, Mélanie; Dale, Daniel A.; Deger, Sinan; Emsellem, Eric; Glover, Simon C.O.; Grasha, Kathryn; Groves, Brent; Henshaw, Jonathan; Jiménez Donaire, María J.; Kim, Jenny J.; Klessen, Ralf S.; Kreckel, Kathryn; Lee, Janice C.; Meidt, Sharon; Sandstrom, Karin; Sardone, Amy E.; Utomo, Dyas; Williams, Thomas G. (IOP Publishing, 2020)

Using the PHANGS-ALMA CO(2-1) survey, we characterize molecular gas properties on similar to 100 pc scales across 102,778 independent sightlines in 70 nearby galaxies. This yields the best synthetic view of molecular gas ...