Low-mass members of nearby young stellar moving groups from <i>Gaia</i> EDR3

نویسندگان

چکیده

Gaia EDR3 offers greatly improved kinematics for nearby objects, including members of young stellar moving groups (NYMGs). In this study, we aim to identify low-mass NYMG (spectral types M0 mid-L) in EDR3. We calculated spatio-kinematic membership probabilities utilising a Bayesian probability calculation scheme developed our previous study. evaluated youth primarily based on colour-magnitude diagram positions. Combining assessment and evaluation, identified ~2900 candidate ~700 previously claimed members. the set ~2200 new members, ~550 appear be NUV brightness. Our pilot spectroscopic study with WiFeS ANU 2.3-m telescope observed 78 candidates, 79 per cent confirmed as Using member sample, estimated an isochronal age beta-Pictoris Moving Group. The mean (~10 Myr), which is around half recent estimates, suggests either truly younger Group or inaccuracies contemporary isochrones. As main results provide lists newly

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Evolution of Dusty Disks in Nearby Young Stellar Groups

Given their proximity and age differences, nearby groups of young stars are valuable laboratories for investigations of disk evolution and diversity. The estimated 10-Myr age of groups like the TW Hydrae Association provides a strong constraint on disk evolution timescales and fills a significant gap in the age sequence between 1-Myr-old T Tauri stars in molecular clouds and 50-Myr-old nearby o...

متن کامل

Stellar Atmospheres of Nearby Young Solar Analogs

High-resolution (R ≈ 90, 000) spectra of 34 nearby, young Sun-like stars were analyzed using stellar atmosphere models to estimate effective photosphere temperatures, surface gravities, and the abundance of certain heavy elements (C, Na, Mg, Si, S, Ca, Ti, Fe, and Ni). The effective temperatures derived from spectroscopy were compared with temperatures estimated using optical and near-infrared ...

متن کامل

Empirical Isochrones for Low Mass Stars in Nearby Young Associations

Absolute ages of young stars are important for many issues in pre-main sequence stellar and circumstellar evolution but are long recognized as difficult to derive and calibrate. In this paper, we use literature spectral types and photometry to construct empirical isochrones in HR diagrams for low-mass stars and brown dwarfs in the η Cha, ǫ Cha, and TW Hya Associations and the β Pic and Tuc-Hor ...

متن کامل

Solid CO2 in low-mass young stellar objects

Context. Solid interstellar CO2 is an abundant component of ice dust mantles. Its ubiquity towards quiescent molecular clouds, as well as protostellar envelopes, has recently been confirmed by the IRS (InfraRed Spectrograph) aboard the Spitzer Space Telescope. Although it has been shown that CO2 cannot be efficiently formed in the gas phase, the CO2 surface formation pathway is still unclear. T...

متن کامل

The Stellar Populations of dSph Galaxies in Nearby Groups

In this contribution initial results are presented from a program to study in detail the stellar populations of dwarf Spheriodal (dSph) galaxies in three nearby groups. The long-term aim of the program is to assess the influence of environment in governing the evolution of these low-luminosity systems. Specific results described here include the detection and measurement of intermediate-age upp...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Monthly Notices of the Royal Astronomical Society

سال: 2022

ISSN: ['0035-8711', '1365-8711', '1365-2966']

DOI: https://doi.org/10.1093/mnras/stac358