2020MNRAS.494.1647R

Query : 2020MNRAS.494.1647R

2020MNRAS.494.1647R - Mon. Not. R. Astron. Soc., 494, 1647-1657 (2020/May-2)

Do fragmentation and accretion affect the stellar initial mass function?

RIAZ R., SCHLEICHER D.R.G., VANAVERBEKE S. and KLESSEN R.S.

Abstract (from CDS):

While the stellar initial mass function (IMF) appears to be close to universal within the Milky Way galaxy, it is strongly suspected to be different in the primordial universe, where molecular hydrogen cooling is less efficient and the gas temperature can be higher by a factor of 30. In between these extreme cases, the gas temperature varies depending on the environment, metallicity, and radiation background. In this paper we explore if changes of the gas temperature affect the IMF of the stars considering fragmentation and accretion. The fragmentation behaviour depends mostly on the Jeans mass at the turning point in the equation of state (EOS) where a transition occurs from an approximately isothermal to an adiabatic regime due to dust opacities. The Jeans mass at this transition in the EOS is always very similar, independent of the initial temperature, and therefore the initial mass of the fragments is very similar. Accretion on the other hand is strongly temperature dependent. We argue that the latter becomes the dominant process for star formation efficiencies above 5-7 per cent, increasing the average mass of the stars.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - hydrodynamics - methods: numerical - stars: protostars - ISM: clouds

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 UCAC3 215-112497 Pe* 10 29 15.1489854864 +17 29 27.924626724   17.424 16.708   15.98 sdA 120 0

Query : 2020MNRAS.494.1647R

Basic data :
UCAC3 215-112497 -- Chemically Peculiar Star
Other object types: otypes_help 		* (2009ApJS,UCAC3,...), MIR (WISEA,WISE), Pe* (2011Natur), NIR (2MASS), Opt (SDSS)
ICRS coord. (ep=J2000) : 		10 29 15.1489854864 +17 29 27.924626724 (Optical) [ 0.0534 0.0430 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		10 26 33.1408722389 +17 44 50.411892552 [ 0.0534 0.0430 90 ]
Gal coord. (ep=J2000) : 		221.7848174585436 +55.8634730787043 [ 0.0534 0.0430 90 ]
Proper motions mas/yr : 		-10.720 -3.921 [0.063 0.054 90] A 2020yCat.1350....0G
Parallaxes (mas): 		0.6482 [0.0598] A 2020yCat.1350....0G
Spectral type: 		sdA D 2019MNRAS.486.2169K
Fluxes (12) :
B 17.424 [0.13] D 2012yCat.1322....0Z
V 16.708 [0.01] D 2012yCat.1322....0Z
G 16.536459 [0.002856] C 2020yCat.1350....0G
I 15.98 [0.35] E 2008AJ....136..735L
J 15.513 [0.052] C 2003yCat.2246....0C
H 15.126 [0.077] C 2003yCat.2246....0C
K 15.146 [0.116] C 2003yCat.2246....0C
u (AB) 17.736 [0.011] C 2009ApJS..182..543A
g 17.008 [0.01] D 2012yCat.1322....0Z
r 16.428 [0.01] D 2012yCat.1322....0Z
i (AB) 16.388 [0.004] B 2009ApJS..182..543A
z (AB) 16.330 [0.008] B 2009ApJS..182..543A
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Identifiers (11) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

UCAC3 215-112497 SDSS J102915.14+172927.9 USNO-B1.0 1074-00222082 Gaia DR2 3890626773968983296
2MASS J10291514+1729278 TIC 63220065 WISEA J102915.22+172928.1 Gaia DR3 3890626773968983296
SDSS J102915.15+172927.9 UCAC4 538-051259 WISE J102915.21+172928.1

References (120 between 1850 and 2026) (Total 120)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Distance : 1    Fe/H : 1    Plx : 2    PM : 2    SpT : 1   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : UCAC3 215-112497

Link by name to the catalogue in VizieR :

UCAC3 215-112497 2MASS J10291514+1729278 SDSS J102915.15+172927.9 SDSS J102915.14+172927.9 UCAC4 538-051259
USNO-B1.0 1074-00222082 WISEA J102915.22+172928.1 WISE J102915.21+172928.1 Gaia DR2 3890626773968983296 Gaia DR3 3890626773968983296

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