USING ULTRA LONG PERIOD CEPHEIDS TO EXTEND THE COSMIC DISTANCE LADDER TO 100 Mpc AND BEYOND

被引:33
作者
Bird, Jonathan C. [1 ]
Stanek, K. Z. [1 ]
Prieto, Jose L. [1 ]
机构
[1] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA
关键词
Cepheids; distance scale; stars: distances; stars: mass loss; NEAR-INFRARED PHOTOMETRY; HUBBLE-SPACE-TELESCOPE; SMALL-MAGELLANIC-CLOUD; SPIRAL GALAXY NGC-300; H-II REGIONS; ARAUCARIA-PROJECT; CHEMICAL-COMPOSITION; LUMINOSITY RELATION; IA SUPERNOVAE; VLT-SPECTROSCOPY;
D O I
10.1088/0004-637X/695/2/874
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We examine the properties of 18 long period (80-210 days) and very luminous (median absolute magnitude of M(I) = -7.86 and M(V) = -6.97) Cepheids to see if they can serve as a useful distance indicator. We find that these Ultra Long Period (ULP) Cepheids have a relatively shallow period-luminosity (PL) relation, so in fact they are more "standard candle" like than classical Cepheids. In the reddening-free Wesenheit index, the slope of the ULP PL relation is consistent with zero. The scatter of our sample about the W(I) PL relation is 0.23 mag, approaching that of classical Cepheids and Type Ia Supernovae. We expect this scatter to decrease as bigger and more uniform samples of ULP Cepheids are obtained. We also measure a nonzero period derivative for one ULP Cepheid (SMC HV829) and use the result to probe evolutionary models and mass loss of massive stars. ULP Cepheids' main advantage over classical Cepheids is that they are more luminous, and as such show great potential as stellar distance indicators to galaxies up to 100 Mpc and beyond.
引用
收藏
页码:874 / 882
页数:9
相关论文
共 55 条
[51]   Cosmological parameters from SDSS and WMAP [J].
Tegmark, M ;
Strauss, MA ;
Blanton, MR ;
Abazajian, K ;
Dodelson, S ;
Sandvik, H ;
Wang, XM ;
Weinberg, DH ;
Zehavi, I ;
Bahcall, NA ;
Hoyle, F ;
Schlegel, D ;
Scoccimarro, R ;
Vogeley, MS ;
Berlind, A ;
Budavari, T ;
Connolly, A ;
Eisenstein, DJ ;
Finkbeiner, D ;
Frieman, JA ;
Gunn, JE ;
Hui, L ;
Jain, B ;
Johnston, D ;
Kent, S ;
Lin, H ;
Nakajima, R ;
Nichol, RC ;
Ostriker, JP ;
Pope, A ;
Scranton, R ;
Seljak, U ;
Sheth, RK ;
Stebbins, A ;
Szalay, AS ;
Szapudi, I ;
Xu, YZ ;
Annis, J ;
Brinkmann, J ;
Burles, S ;
Castander, FJ ;
Csabai, I ;
Loveday, J ;
Doi, M ;
Fukugita, M ;
Gillespie, B ;
Hennessy, G ;
Hogg, DW ;
Ivezic, Z ;
Knapp, GR .
PHYSICAL REVIEW D, 2004, 69 (10)
[52]   Star formation in gaseous galaxy halos -: VLT-spectroscopy of extraplanar HII-regions in NGC55 [J].
Tüllmann, R ;
Rosa, MR ;
Elwert, T ;
Bomans, DJ ;
Ferguson, AMN ;
Dettmar, RJ .
ASTRONOMY & ASTROPHYSICS, 2003, 412 (01) :69-80
[53]  
Udalski A, 1999, ACTA ASTRONOM, V49, P201
[54]   On the α-element abundance gradients in the disk of the sculptor spiral galaxy NGC 300 [J].
Urbaneja, MA ;
Herrero, A ;
Bresolin, F ;
Kudritzki, RP ;
Gieren, W ;
Puls, J ;
Przybilla, N ;
Najarro, F ;
Pietrzynski, G .
ASTROPHYSICAL JOURNAL, 2005, 622 (02) :862-877
[55]  
Van Genderen A. M., 1983, Astronomy & Astrophysics Supplement Series, V52, P423