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Titolo:
WFPC2 observations of two dwarf spheroidal galaxies in the M 81 group
Autore:
Karachentsev, ID; Sharina, ME; Dolphin, AE; Geisler, D; Grebel, EK; Guhathakurta, P; Hodge, PW; Karachentseva, VE; Sarajedini, A; Seitzer, P;
Indirizzi:
Russian Acad Sci, Special Astrophys Observ, N Arkhyz, KChR, Russia RussianAcad Sci N Arkhyz KChR Russia hys Observ, N Arkhyz, KChR, Russia Natl Opt Astron Observ, Kitt Peak Natl Observ, Tucson, AZ 85726 USA Natl Opt Astron Observ Tucson AZ USA 85726 l Observ, Tucson, AZ 85726 USA Concepcion Univ, Astron Grp, Dept Fis, Concepcion, Chile Concepcion Univ Concepcion Chile stron Grp, Dept Fis, Concepcion, Chile Max Planck Inst Astron, D-69117 Heidelberg, Germany Max Planck Inst Astron Heidelberg Germany D-69117 17 Heidelberg, Germany Univ Calif Santa Cruz, Univ Calif Observ, Lick Observ, Santa Cruz, CA 95064 USA Univ Calif Santa Cruz Santa Cruz CA USA 95064 v, Santa Cruz, CA 95064 USA Univ Washington, Dept Astron, Seattle, WA 98195 USA Univ Washington Seattle WA USA 98195 , Dept Astron, Seattle, WA 98195 USA Univ Kiel, Astron Observ, Kiev, Ukraine Univ Kiel Kiev UkraineUniv Kiel, Astron Observ, Kiev, Ukraine Wesleyan Univ, Dept Astron, Middletown, CT 06459 USA Wesleyan Univ Middletown CT USA 06459 pt Astron, Middletown, CT 06459 USA Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA Univ Michigan Ann Arbor MI USA 48109 Dept Astron, Ann Arbor, MI 48109 USA Isaac Newton Inst, SAO Branch, Moscow, Russia Isaac Newton Inst Moscow Russia Newton Inst, SAO Branch, Moscow, Russia
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 2, volume: 375, anno: 2001,
pagine: 359 - 365
SICI:
1432-0746(200108)375:2<359:WOOTDS>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
RED GIANT BRANCH; STELLAR POPULATIONS; DISTANCE INDICATOR; RESOLVED GALAXIES; M81 GROUP; TIP; CALIBRATION;
Keywords:
galaxies : dwarf; galaxies : stellar content; galaxies : distances; galaxies : M 81 group : FM1 and KKH57;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Karachentsev, ID Russian Acad Sci, Special Astrophys Observ, N Arkhyz, KChR, Russia Russian Acad Sci N Arkhyz KChR Russia hyz, KChR, Russia
Citazione:
I.D. Karachentsev et al., "WFPC2 observations of two dwarf spheroidal galaxies in the M 81 group", ASTRON ASTR, 375(2), 2001, pp. 359-365

Abstract

We have obtained HST WFPC2 and ground-based images of two low surface brightness dwarf spheroidal galaxies in the M 81 group, FM1 and KKH57. Their colour-magnitude diagrams show red giant branches with tips at I = 23.77 +/- 0.14 and I = 23.97 +/- 0.17, respectively. The derived true distance moduli, 27.66 +/- 0.16 and 27.96 +/- 0.19, agree well with the mean distance modulus of the M 81 group, 27.84 +/- 0.05. Absolute V magnitudes of the galaxies (-11.46 and -10.85), their colours ((B-V) = 0.88 and 0.80), and central surface brightnesses (Sigma (0,V) = 24.8 and 24.4 mag/square") are in the range of other dSph companions of M 81, M 31, and Milky Way. With two new objects the maximum projected radius of the dwarf spheroidal subsystem around M 81 is 380 kpc.

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Documento generato il 15/01/21 alle ore 21:58:33