scholarly journals Evolution Of The Lithium Abundances Of Solar-Type Stars. IX. High-Resolution Spectroscopy of Low-Mass Stars in NGC 2264

1999 ◽  
Vol 118 (3) ◽  
pp. 1301-1314 ◽  
Author(s):  
David R. Soderblom ◽  
Jeremy R. King ◽  
Lionel Siess ◽  
Burton F. Jones ◽  
Debra Fischer
Keyword(s):  
High Resolution ◽  
High Resolution Spectroscopy ◽  
Low Mass Stars ◽  
Solar Type ◽  
Low Mass

scholarly journals Multi-Wavelength High-Resolution Spectroscopy for Exoplanet Detection: Motivation, Instrumentation and First Results

Geosciences ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 289 ◽  
Author(s):  
Serena Benatti
Keyword(s):  
High Resolution ◽  
Near Infrared ◽  
Giant Planet ◽  
High Resolution Spectroscopy ◽  
M Dwarfs ◽  
Low Mass Stars ◽  
First Results ◽  
Multi Wavelength ◽  
Low Mass ◽  
Rocky Planets

Exoplanet research has shown an incessant growth since the first claim of a hot giant planet around a solar-like star in the mid-1990s. Today, the new facilities are working to spot the first habitable rocky planets around low-mass stars as a forerunner for the detection of the long-awaited Sun-Earth analog system. All the achievements in this field would not have been possible without the constant development of the technology and of new methods to detect more and more challenging planets. After the consolidation of a top-level instrumentation for high-resolution spectroscopy in the visible wavelength range, a huge effort is now dedicated to reaching the same precision and accuracy in the near-infrared. Actually, observations in this range present several advantages in the search for exoplanets around M dwarfs, known to be the most favorable targets to detect possible habitable planets. They are also characterized by intense stellar activity, which hampers planet detection, but its impact on the radial velocity modulation is mitigated in the infrared. Simultaneous observations in the visible and near-infrared ranges appear to be an even more powerful technique since they provide combined and complementary information, also useful for many other exoplanetary science cases.

scholarly journals High-resolution spectroscopy of detached solar-type eclipsing binaries observed during the Kepler K2 mission

2020 ◽  
Vol 493 (2) ◽  
pp. 2329-2338
Author(s):  
B Hoyman ◽  
Ö Çakırlı
Keyword(s):  
Theoretical Models ◽  
Eclipsing Binaries ◽  
High Resolution Spectroscopy ◽  
Physical Parameters ◽  
Evolutionary Status ◽  
Low Mass Stars ◽  
Ongoing Effort ◽  
Stellar Parameter ◽  
Solar Type ◽  
Low Mass

ABSTRACT Solar-type stars in eclipsing binaries are proving to be a remarkable resource of knowledge for testing models of stellar evolution, as spectroscopic and photometric studies have opened up a window into their interiors. Until recently, many cases have been worked out with Kepler data. In an ongoing effort to elucidate this research, we examine five detached eclipsing binaries, selected from the Kepler catalogue. There is a well-known stellar parameter discrepancy for low-mass stars, in that the observed radii and masses are often larger and stars overluminous than predicted by theory by several per cent. In our samples, we found five double-lined binaries, with solar-type stars dominating the spectrum. The orbital and light-curve solutions were found for them, and compared with isochrones, in order to estimate absolute physical parameters and evolutionary status of the components. An important aspect of this work is that the calculated stellar radii and masses are consistent with theoretical models within the uncertainties, whereas the estimated temperatures from the disentangled spectra of the components are no different than predicted.

scholarly journals Exploring Flaring Behaviour on Low Mass Stars, Solar-type Stars and the Sun

2019 ◽  
Vol 15 (S354) ◽  
pp. 384-391
Author(s):  
L. Doyle ◽  
G. Ramsay ◽  
J. G. Doyle ◽  
P. F. Wyper ◽  
E. Scullion ◽  
...  
Keyword(s):  
High Energy ◽  
The Sun ◽  
Low Mass Stars ◽  
Highly Active ◽  
Rotation Phase ◽  
Solar Type ◽  
Low Mass ◽  
Insight Into ◽  
Reconnection Model ◽  
High Cadence

AbstractWe report on our project to study the activity in both the Sun and low mass stars. Utilising high cadence, Hα observations of a filament eruption made using the CRISP spectropolarimeter mounted on the Swedish Solar Telescope has allowed us to determine 3D velocity maps of the event. To gain insight into the physical mechanism which drives the event we have qualitatively compared our observation to a 3D MHD reconnection model. Solar-type and low mass stars can be highly active producing flares with energies exceeding erg. Using K2 and TESS data we find no correlation between the number of flares and the rotation phase which is surprising. Our solar flare model can be used to aid our understanding of the origin of flares in other stars. By scaling up our solar model to replicate observed stellar flare energies, we investigate the conditions needed for such high energy flares.

High Resolution CO Observations of Young Low Mass Stars

1988 ◽  
pp. 297-302
Author(s):  
S. Terebey ◽  
S. N. Vogel ◽  
P. C. Myers
Keyword(s):  
High Resolution ◽  
Low Mass Stars ◽  
Low Mass ◽  
Co Observations

scholarly journals High-resolution spectra of very low-mass stars

1998 ◽  
Vol 301 (4) ◽  
pp. 1031-1048 ◽  
Author(s):  
C. G. Tinney ◽  
I. N. Reid
Keyword(s):  
High Resolution ◽  
Low Mass Stars ◽  
Low Mass

scholarly journals PHYSICAL PROPERTIES OF YOUNG BROWN DWARFS AND VERY LOW MASS STARS INFERRED FROM HIGH-RESOLUTION MODEL SPECTRA

2009 ◽  
Vol 186 (1) ◽  
pp. 63-84 ◽  
Author(s):  
Emily L. Rice ◽  
T. Barman ◽  
Ian S. Mclean ◽  
L. Prato ◽  
J. Davy Kirkpatrick
Keyword(s):  
High Resolution ◽  
Physical Properties ◽  
Brown Dwarfs ◽  
Low Mass Stars ◽  
Resolution Model ◽  
Low Mass ◽  
High Resolution Model

scholarly journals The rotation of very low-mass stars and brown dwarfs

2007 ◽  
Vol 3 (S243) ◽  
pp. 241-248
Author(s):  
Jochen Eislöffel ◽  
Alexander Scholz
Keyword(s):  
Angular Momentum ◽  
Brown Dwarfs ◽  
Magnetic Interaction ◽  
Stellar Winds ◽  
Solar Mass ◽  
Low Mass Stars ◽  
Angular Momentum Loss ◽  
Rotational Evolution ◽  
Solar Type ◽  
Low Mass

AbstractThe evolution of angular momentum is a key to our understanding of star formation and stellar evolution. The rotational evolution of solar-mass stars is mostly controlled by magnetic interaction with the circumstellar disc and angular momentum loss through stellar winds. Major differences in the internal structure of very low-mass stars and brown dwarfs – they are believed to be fully convective throughout their lives, and thus should not operate a solar-type dynamo – may lead to major differences in the rotation and activity of these objects. Here, we report on observational studies to understand the rotational evolution of the very low-mass stars and brown dwarfs.

scholarly journals Retrieval of Precise Radial Velocities from Near-infrared High-resolution Spectra of Low-mass Stars

2016 ◽  
Vol 128 (968) ◽  
pp. 104501 ◽  
Author(s):  
Peter Gao ◽  
Plavchan P. ◽  
Gagné J. ◽  
Furlan E. ◽  
Bottom M. ◽  
...  
Keyword(s):  
High Resolution ◽  
Near Infrared ◽  
Radial Velocities ◽  
Low Mass Stars ◽  
Low Mass

scholarly journals High-resolution spectroscopy of the low-mass X-ray binary EXO 0748-67

2001 ◽  
Vol 365 (1) ◽  
pp. L277-L281 ◽  
Author(s):  
J. Cottam ◽  
S. M. Kahn ◽  
A. C. Brinkman ◽  
J. W. den Herder ◽  
C. Erd
Keyword(s):  
High Resolution ◽  
High Resolution Spectroscopy ◽  
X Ray ◽  
Low Mass

scholarly journals A Search for Lithium in Brown Dwarf Candidates

1993 ◽  
Vol 137 ◽  
pp. 171-173
Author(s):  
Rafael Rebolo ◽  
Eduardo L. Martin ◽  
Antonio Magazzu
Keyword(s):  
High Resolution ◽  
Resonance Line ◽  
Brown Dwarfs ◽  
Brown Dwarf ◽  
Low Mass Stars ◽  
Substellar Objects ◽  
Low Mass

AbstractWe are conducting a search for lithium in very low mass objects with the aim of discriminating between stellar and substellar objects. Lithium is expected to be preserved in brown dwarfs with M/M⊙ ≤0.06, while it is known to be efficiently destroyed in low mass stars. In this paper we present high resolution observations in the region of the λ 6708 Li I resonance line of 5 very low mass dwarfs. In none of them lithium is detected, implying a Li destruction in their atmospheres of about four orders of magnitude. Our results suggest that these objects are probably very low mass stars rather than brown dwarfs.

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