Distance and reddening of the Local Group dwarf irregular galaxy NGC 6822

被引：11

作者：

Fusco, F. ^{[1
]}

Buonanno, R. ^{[1
,2
]}

Bono, G. ^{[1
]}

Cassisi, S. ^{[2
]}

Monelli, M. ^{[3
,4
]}

Pietrinferni, A. ^{[2
]}

机构：

[1] Univ Roma Tor Vergata, I-00133 Rome, Italy

[2] Osservatorio Astron Teramo, INAF, I-64100 Teramo, Italy

[3] Inst Astrofis Canarias, Tenerife 38200, Spain

[4] Univ La Laguna, Dept Astrofis, Tenerife 38200, Spain

来源：

ASTRONOMY & ASTROPHYSICS | 2012年 / 548卷

关键词：

galaxies: dwarf; Local Group; galaxies: individual: NGC 6822; RED GIANT BRANCH; STELLAR EVOLUTION DATABASE; POPULATION SYNTHESIS; STARS; TIP; ISOCHRONES; MODELS; CALIBRATION; ABUNDANCES; PHOTOMETRY;

D O I：

10.1051/0004-6361/201220554

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

On the basis of a new photometric analysis of the Local Group dwarf irregular galaxy NCG 6822 based on observations obtained with the Advanced Camera for Surveys onboard the Hubble Space Telescope, we have obtained a new estimate of the extinction of two fields located in the southeast region of the galaxy. Because of significant differences in the distance estimates to NGC 6822 available in literature, we decided to provide an independent determination of the distance to this galaxy based on an updated and self-consistent theoretical calibration of the tip of the red giant branch brightness. As a result we newly determined the distance to NGC 6822 to be equal to (m - M)(0) = 23.54 +/- 0.05, and compared our measurement with the most recent determinations of this distance.

引用

页数：5

共 35 条

[1] Barnard E. E., 1884, SIDEREAL MESSENGER, V3, P254
[2] Transforming observational data and theoretical isochrones into the ACS/WFC Vega-mag system
Bedin, LR
Cassisi, S
Castelli, F
Piotto, G
Anderson, J
Salaris, M
Momany, Y
Pietrinferni, A
[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2005, 357 (03) : 1038 - 1048
[3] Bellazzini M., 2008, MMSAI, V79, P440
[4] THE ACS LCID PROJECT. II. FAINT VARIABLE STARS IN THE ISOLATED DWARF IRREGULAR GALAXY IC 1613
Bernard, Edouard J.
Monelli, Matteo
Gallart, Carme
Aparicio, Antonio
Cassisi, Santi
Drozdovsky, Igor
Hidalgo, Sebastian L.
Skillman, Evan D.
Stetson, Peter B.
[J]. ASTROPHYSICAL JOURNAL, 2010, 712 (02) : 1259 - 1276
[5] Cannon J. M., 2011, APJ, V652, P1170
[6] Updated electron-conduction opacities: The impact on low-mass stellar models
Cassisi, S.
Potekhin, A. Y.
Pietrinferni, A.
Catelan, M.
Salaris, M.
[J]. ASTROPHYSICAL JOURNAL, 2007, 661 (02) : 1094 - 1104
[7] Cassisi S., 2012, OLD STELLAR POPULATI
[8] Near-IR observations of NGC 6822: AGB stars, distance, metallicity and structure
Cioni, MRL
Habing, HJ
[J]. ASTRONOMY & ASTROPHYSICS, 2005, 429 (03) : 837 - 850
[9] STANDARD GLOBULAR-CLUSTER GIANT BRANCHES IN THE (MI,(V-I)O) PLANE
DACOSTA, GS
ARMANDROFF, TE
[J]. ASTRONOMICAL JOURNAL, 1990, 100 (01) : 162 - 181
[10] Evidence for tidal interaction and a supergiant HI shell in the local group dwarf galaxy NGC 6822
de Blok, WJG
Walter, F
[J]. ASTROPHYSICAL JOURNAL, 2000, 537 (02) : L95 - L98

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