2006ApJ...652L..37L

Query : 2006ApJ...652L..37L

2006ApJ...652L..37L - Astrophys. J., 652, L37-L40 (2006/November-3)

The frequency of carbon-enhanced metal-poor stars in the galaxy from the HERES sample.

LUCATELLO S., BEERS T.C., CHRISTLIEB N., BARKLEM P.S., ROSSI S., MARSTELLER B., SIVARANI T. and LEE Y.S.

Abstract (from CDS):

We estimate the frequency of carbon-enhanced metal-poor (CEMP) stars among very metal-poor stars, based on an analysis of 349 stars with available high-resolution spectra observed as part of the Hamburg/ESO R-process Enhanced Star (HERES) survey. We obtain that a lower limit of 21%±2% of stars with [Fe/H] ≤-2.0 exhibit [C/Fe] ≥+1.0. These fractions are higher than those that have been reported by recent examinations of this question, based on substantially smaller samples of stars. We discuss the source of this difference and suggest that in order to take into account effects that result in a decrease of surface carbon abundance with advancing evolution, a definition of CEMP stars based on a [C/Fe] cutoff that varies as a function of luminosity is more appropriate. We discuss the likely occurrence of dilution and mixing for many CEMP stars, which, if properly accounted for, would increase this fraction still further.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Halo - Stars: Abundances - Stars: Carbon - Stars: Population II

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	HE 1413-1954	Pe*	14 16 04.7119539312	-20 08 54.089976552			15.235		14.593	CEMP-no	18	0

Query : 2006ApJ...652L..37L

Basic data :

HE 1413-1954 -- Chemically Peculiar Star

Pe* (2005A&A), * (2007ApJS,Gaia), NIR (2MASS)

14 16 04.7119539312 -20 08 54.089976552 (Optical) [ 0.0324 0.0305 90 ] A 2020yCat.1350....0G

14 13 17.5080297696 -19 54 59.822390858 [ 0.0324 0.0305 90 ]

328.5804546106584 +38.4714392986563 [ 0.0324 0.0305 90 ]

-20.010 -1.416 [0.044 0.038 90] A 2020yCat.1350....0G

V(km/s) -100.4 [~] / z(spectroscopic) -0.000335 [~] / cz -100.38 [~] (Opt) D 2005A&A...439..129B

0.5088 [0.0453] A 2020yCat.1350....0G

CEMP-no C 2016ApJ...833...20Y

V 15.235 [0.005] D 2007ApJS..168..128B

G 15.170948 [0.002787] C 2020yCat.1350....0G

I 14.593 [0.009] D 2007ApJS..168..128B

J 14.188 [0.026] C 2003yCat.2246....0C

H 13.973 [0.022] C 2003yCat.2246....0C

K 13.889 [0.053] C 2003yCat.2246....0C

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`2MASS J14160471-2008540`	`TIC 46020596`	`Gaia DR3 6277932329101971328`
`HE 1413-1954`	`Gaia DR2 6277932329101971328`

References (18 between 1850 and 2026) (Total 18)
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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2MASS J14160471-2008540 Gaia DR2 6277932329101971328 Gaia DR3 6277932329101971328

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