The Araucaria Project. The Distance to the Sculptor Group Galaxy NGC 7793 from Near-infrared Photometry of Cepheid Variables
The Araucaria Project. The Distance to the Sculptor Group Galaxy NGC 7793 from Near-infrared Photometry of Cepheid Variables
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南洋杉项目。
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
F. Bresolin
中科院分区：
文献类型：
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作者：
B. Zgirski;W. Gieren;G. Pietrzyński;P. Karczmarek;M. Górski;P. Wielgórski;W. Narloch;D. Graczyk;R. Kudritzki;F. Bresolin
在早期发现经典造父变星在玉夫座群螺旋星系NGC 7793从光学宽视场成像调查，我们已经进行了深近红外J-和K-波段后续测光这些造父变星的子样本，以获得更高的精度比什么是可能的，从光学测光到这个星系的距离，通过最小化变红和金属含量对距离结果的影响。结合我们的新的近红外周期光度关系和以前的光学光度学，我们得到了NGC 7793的真实距离模量为（27.66 ± 0.04）mag（统计）±0.07 mag（系统），即，距离为（3.40 ± 0.17）Mpc。我们还确定影响造父变星的平均红化为E（B − V）=（0.08 ± 0.02）等，这表明除了小的前景消光外，星系本身还存在显著的尘埃消光。新的，改进的造父变星距离的比较，早期的距离测定NGC 7793的塔利-费舍尔和TRGB方法是在协议内报告的不确定性，这些以前的测量。
Following the earlier discovery of classical Cepheid variables in the Sculptor Group spiral galaxy NGC 7793 from an optical wide-field imaging survey, we have performed deep near-infrared J- and K-band follow-up photometry of a subsample of these Cepheids to derive the distance to this galaxy with a higher accuracy than what was possible from optical photometry alone, by minimizing the effects of reddening and metallicity on the distance result. Combining our new near-infrared period–luminosity relations with previous optical photometry, we obtain a true distance modulus to NGC 7793 of (27.66 ± 0.04) mag (statistical) ±0.07 mag (systematic), i.e., a distance of (3.40 ± 0.17) Mpc. We also determine the mean reddening affecting the Cepheids to be E(B − V) = (0.08 ± 0.02) mag, demonstrating that there is significant dust extinction intrinsic to the galaxy in addition to the small foreground extinction. A comparison of the new, improved Cepheid distance to earlier distance determinations of NGC 7793 from the Tully–Fisher and TRGB methods is in agreement within the reported uncertainties of these previous measurements.
影响因子：
6.5
作者：
M. Romaniello;F. Primas;M. Mottini;S. Pedicelli;B. Lemasle;G. Bono;G. Bono;P. Francois;
通讯作者：
M. Romaniello;F. Primas;M. Mottini;S. Pedicelli;B. Lemasle;G. Bono;G. Bono;P. Francois;