Radio stars of the SKA
arXiv:2104.12520 · doi:10.3390/universe7050119
Abstract
Radio emission from stars can be used, e.g., to study ionized winds or stellar flares. The radio emission is faint and studies have been limited to few objects. The Square Kilometer Array (SKA) will bring a survey ability to the topic of radio stars. In this paper we investigate what the SKA can detect, and what sensitivity will be required for deep surveys of the stellar Milky Way. We focus on the radio emission from OB stars, Be stars, flares from M dwarfs, and Ultra Compact HII regions. The stellar distribution in the Milky Way is simulated using the Besancon model, and various relations are used to predict their radio flux. We find that the full SKA will easily detect all UltraCompact HII regions. At the limit of 10 nJy at 5 GHz, the SKA can detect 1500 Be stars and 50 OB stars per square degree, out to several kpc. It can also detect flares from 4500 M dwarfs per square degree. At 100 nJy the numbers become about 8 times smaller. SKA surveys of the Galactic plane should be designed for high sensitivity. Deep imaging should consider the significant number of faint flares in the field, even outside the plane of the Milky Way.
arXiv comment23 pages, 13 figures
References in corpus (25)
- Binary interaction dominates the evolution of massive stars
- Constraining the Age-Activity Relation for Cool Stars: The SDSS DR5 Low-Mass Star Spectroscopic Sample
- Classical Be Stars: Rapidly Rotating B Stars with Viscous Keplerian Decretion Disks
- New Neighbors from 2MASS: Activity and Kinematics at the Bottom of the Main Sequence
- Superflares on Solar Type Stars Observed with Kepler I. Statistical Properties of Superflares
- Stellar Radio Astronomy. Probing Stellar Atmospheres from Protostars to Giants
- Stellar Flares from the First Tess Data Release: Exploring a New Sample of M-dwarfs
- Spectroscopic Properties of Cool Stars in the SDSS: An Analysis of Magnetic Activity and a Search for Subdwarfs
- Stellar populations in the Milky Way bulge region : Towards solving the Galactic bulge and bar shapes using 2MASS data
- Meeting the Cool Neighbors VIII: A preliminary 20-parsec census from the NLTT catalogue
- Constraining the thick disc formation scenario of the Milky Way
- The Luminosity Functions and Timescales of MYSOs and Compact HII regions
- Ultra-Wideband Detection of 22 Coherent Radio Bursts on M Dwarfs
- Anticipated Performance of the Square Kilometre Array -- Phase 1 (SKA1)
- The Luminosity and Mass Functions of Low-Mass Stars in the Galactic Disk: I. The Calibration Region
- CHARA Array K'-band Measurements of the Angular Dimensions of Be Star Disks
- Evolution over time of the Milky Way's disc shape
- Simultaneous Multi-Wavelength Observations of Magnetic Activity in Ultracool Dwarfs. I. The Complex Behavior of the M8.5 Dwarf TVLM513-46546
- Kinematics of the local disk from the RAVE survey and the Gaia first data release
- New theoretical Mass-loss rates of O and B Stars
- Quasi integral of motion for axisymmetric potentials
- The theory of stellar winds
- Evidence of Particle Acceleration in the Superbubble 30 Doradus C with NuSTAR
- The Solar--Stellar Connection
- The Square Kilometer Array: cosmology, pulsars and other physics with the SKA