1994A&A...287..769B

Query : 1994A&A...287..769B

1994A&A...287..769B - Astronomy and Astrophysics, volume 287769-781 (1994/7-3)

HST observations of the core of globular cluster NGC 6397.

BURGARELLA D., PARESCE F., MEYLAN G., KING I.R., GREENFIELD P., BAXTER D., JEDRZEJEWSKI R., NOTA A., ALBRECHT R., BARBIERI C., BLADES J.C., BOKSENBERG A., CRANE P., DEHARVENG J.M., DISNEY M.J., JAKOBSEN P., KAMPERMAN T.M., MACCHETTO F., MacKAY C.D. and WEIGELT G.

Abstract (from CDS):

The core of the nearby and very concentrated globular cluster NGC 6397 has been imaged through the f/96-F140W, f/48-F140W, f/96-F210M, and f/48-F220W ultraviolet filters of the Faint Object Camera on board the Hubble Space Telescope down to an ultraviolet limiting magnitude of ∼19. The most interesting objects in the field of view are six very bright, centrally concentrated, blue stragglers observed for the first time in the UV. Using these and other data from ground-based observations, we have been able to deduce from a comparison with Kurucz's atmosphere models, temperatures of ∼10000 K and masses of ∼1.6M_☉ for the four brightest ones, which is remarkably close to twice the turn-off mass of NGC 6397. This finding supports the idea that two-star mechanisms (collisions, mergers) are at the origin of the blue stragglers in the core of NGC 6397. Since the central density is very high, collisions between main sequence stars are frequent, therefore providing the best formation mechanism. We have computed the number of such collisions in the core of NGC 6397 and found it to be of the same order as the number of bright blue stragglers observed there. Thanks to the HST resolution, we have also been able to resolve one object, previously classified as a yellow straggler, into a blend of a blue straggler and three redder stars.

Abstract Copyright: ∼

Journal keyword(s): stars: binaries: close - stars: blue stragglers - stars: population II - globular clusters: individual: NGC 6397 - ultraviolet: stars - stars: kinematics

VizieR on-line data: <Available at CDS (J/A+A/287/769): table2>

Nomenclature: Cl* NGC 6397 BPM NNN N=179 among (Nos 1-187).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

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	NGC 6397	GlC	17 40 42.09	-53 40 27.6			5.17			~	2103	0

Query : 1994A&A...287..769B

Basic data :

NGC 6397 -- Globular Cluster

GlC (2013A&A,GCl), Cl* (C,[KPS2012])

17 40 42.09 -53 40 27.6 (Optical) [ ] D 2010AJ....140.1830G

17 36 37.84 -53 38 53.5 [ ]

338.16501 -11.95952 [ ]

3.30 -17.60 [0.01 0.01 90] C 2019MNRAS.482.5138B

V(km/s) 18.4 [0.1] / z(spectroscopic) 0.000061 [0.000000] / cz 18.40 [0.10] (Opt) A 2018MNRAS.478.1520B

0.416 [0.010] C 2021MNRAS.505.5978V

25.7 25.7 90 (Opt) D 1989Sci...246.1066D

V 5.17 [~] D 2012AJ....144..126D

K 3.29 [~] D 2008MNRAS.389.1924F

z (AB) 5.450 [0.044] C 2014MNRAS.437.1725V

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NGC 6397 C 1736-536 GCl 74 [KPS2012] MWSC 2662

References (2103 between 1850 and 2026) (Total 2103)
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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Data at NED - NASA/IPAC Extragalactic Database : NGC 6397

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