2018MNRAS.473..447L


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.23CEST03:37:02

2018MNRAS.473..447L - Mon. Not. R. Astron. Soc., 473, 447-456 (2018/January-1)

Rontgen spheres around active stars.

LOCCI D., CECCHI-PESTELLINI C., MICELA G., CIARAVELLA A. and ARESU G.

Abstract (from CDS):

X-rays are an important ingredient of the radiation environment of a variety of stars of different spectral types and age. We have modelled the X-ray transfer and energy deposition into a gas with solar composition, through an accurate description of the electron cascade following the history of the primary photoelectron energy deposition. We test and validate this description studying the possible formation of regions in which X-rays are the major ionization channel. Such regions, called Rontgen spheres may have considerable importance in the chemical and physical evolution of the gas embedding the emitting star. Around massive stars the concept of Rontgen sphere appears to be of limited use, as the formation of extended volumes with relevant levels of ionization is efficient just in a narrow range of gas volume densities. In clouds embedding low-mass pre-main-sequence stars significant volumes of gas are affected by ionization levels exceeding largely the cosmic-ray background ionization. In clusters arising in regions of vigorous star formation X-rays create an ionization network pervading densely the interstellar medium, and providing a natural feedback mechanism, which may affect planet and star formation processes.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): atomic processes - radiative transfer - X-rays: ISM - X-rays: stars - X-rays: stars

Simbad objects: 23

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Number of rows : 23

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 * bet Hyi PM* 00 25 45.07036 -77 15 15.2860 3.52 3.41 2.79 2.28 1.94 G0V 529 0
2 * kap01 Cet BY* 03 19 21.6963205 +03 22 12.715139 5.71 5.52 4.85 4.27 3.91 G5V 811 0
3 LDN 1495 DNe 04 18.1 +27 37           ~ 274 1
4 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3310 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14325 1
6 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1906 1
7 NAME Ori A MoC 05 38 -07.1           ~ 2611 0
8 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1026 2
9 RMC 136 Cl* 05 38 42.396 -69 06 03.36   9.63 9.50     ~ 1674 2
10 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1127 0
11 * chi01 Ori RS* 05 54 22.9829893 +20 16 34.222038 5.08 5.00 4.40 3.90 3.59 G0V 789 0
12 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 812 1
13 V* pi.01 UMa BY* 08 39 11.7043265307 +65 01 15.268273190 6.33 6.26 5.64 5.12 4.79 G0.5V 508 0
14 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2148 0
15 NAME Cha I MoC 11 06 48 -77 18.0           ~ 936 1
16 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 263 0
17 * bet Com PM* 13 11 52.3937856 +27 52 41.453553 4.92 4.84 4.25 3.77 3.47 F9.5V 837 0
18 V* EK Dra BY* 14 39 00.2109485496 +64 17 29.977371998   8.243 7.604     G1.5V 367 0
19 NAME Upper Sco Association As* 16 12 -23.4           ~ 959 1
20 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 592 2
21 HD 150136 SB* 16 41 20.4156742370 -48 45 46.728092318 4.98 5.78 5.65 6.93   O3.5-4III(f*)+O6IV 170 0
22 WR 93b WR* 17 32 03.3085935721 -35 04 32.618191778           WO3 14 0
23 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 759 0

    Equat.    Gal    SGal    Ecl

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2019.10.23-03:37:02

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