Results 61 to 70 of about 10,963 (195)

The Hubble Space Telescope Extragalactic Distance Scale Key Project. X. The Cepheid Distance to NGC 7331

, 1998
The distance to NGC 7331 has been derived from Cepheid variables observed with HST/WFPC2, as part of the Extragalactic Distance Scale Key Project. Multi-epoch exposures in F555W (V) and F814W (I), with photometry derived independently from DoPHOT and ...
Abhijit Saha, Balkowski C., Barry F. Madore, Begeman K. G., Bottinelli L., Brad K. Gibson, Garcia A. M., Garth D. Illingworth, Holland Ford, Jeremy R. Mould, John A. Graham, John Hoessel, John Huchra, Laura Ferrarese, Marcelin M., Martin W. L., Mingsheng Han, Nancy A. Silbermann, Osman A. M. I., Paul Harding, Peter B. Stetson, Randy Phelps, Rawson D. M., Robert C. Kennicutt, Jr., Robert Hill, Sasselov D. D., Sersic J. L., Shaun M. G. Hughes, Shoko Sakai, Stift M. J., van den Bergh S., Wendy L. Freedman   +31 more
core   +1 more source

Hubble Space Telescope Fine Guidance Sensor Parallaxes of Galactic Cepheid Variable Stars: Period-Luminosity Relations [PDF]

, 2006
(abridged) We present new absolute trigonometric parallaxes and relative proper motions for nine Galactic Cepheid variable stars: l Car, zeta Gem, beta Dor, W Sgr, X Sgr, Y Sgr, FF Aql, T Vul, and RT Aur.
Barnes, Thomas G., Bean, Jacob L., Benedict, G. Fritz, Feast, Michael W., Freedman, Wendy L., Harrison, Thomas E., McArthur, Barbara E., Menzies, John W., Patterson, Richard J.   +8 more
core   +2 more sources

Cepheids as Distance Indicators

, 1996
We review the use of Cepheids as distance indicators with particular emphasis on the methods which have been applied to HST observations of Cepheids. The calibration of the period-luminosity relations is examined in detail and we identify possible problems with the existing calibrations. New V- and I-band period luminosity relations are presented based
openaire   +2 more sources

HipparcosParallaxes and the Cepheid Distance Scale [PDF]

The Astrophysical Journal, 1998
15 pages, 4 figures, Ap. J.
Madore, Barry F., Freedman, Wendy L.
openaire   +2 more sources

‘Why Didn't I Get That Choice?’: A Qualitative Exploration of How Cervical Screening Choices Are Understood and Experienced by Screen‐Eligible People in Australia, Two Years After Self‐Collection Became an Option for All

Health Expectations, Volume 28, Issue 4, August 2025.
ABSTRACT Background Australia's human papillomavirus (HPV)‐based National Cervical Screening Program guidelines state that anyone eligible for screening should be offered a choice of using self‐collection or clinician collection for initial screening. Aim To explore the awareness and experiences of women and people with a cervix who have been screened ...
Ana Machado Colling, Tessa Saunders, Nicola Creagh, Maleeha Ashfaq, Julia Brotherton, Claire Nightingale   +5 more
wiley   +1 more source

Determination of the Hubble Constant Using a Two-Parameter Luminosity Correction for Type Ia Supernovae

, 1999
In this paper, we make a comprehensive determination of the Hubble constant $H_0$ by using two parameters - the B-V color and the rate of decline $\Delta m_{15}$ - to simultaneously standardize the luminosities of all nearby Cepheid-calibrated type Ia ...
Beaulieu J. P., David Branch, Nevalainen J., Robert Tripp, Tripp R.   +4 more
core   +1 more source

Search for Classical Cepheids in Galactic Open Clusters and Calibration of the Period–Wesenheit–Metallicity Relation in the Gaia Bands

The Astronomical Journal
It is beneficial to calibrate the period–Wesenheit–metallicity relation (PWZR) of Delta Cephei stars (DCEPs), i.e., classical Cepheids, using accurate parallaxes of associated open clusters (OCs) from Gaia data release 3 (DR3).
Huajian Wang, Ye Xu, Zehao Lin, Chaojie Hao, Dejian Liu, Yingjie Li   +5 more
doaj   +1 more source

Z-Distribution and Period Gradient of Classical Cepheids in the Galactic Plane [PDF]

Journal of Astronomy and Space Sciences, 1986
The z-coordinate distribution of cepheids was studied and the finding of Fernie(1968) that the Cepheid layer is inclined toward a formal Galactic plane and the Sun is located above the cepheid plane was confirmed.
Chulhee Kim
doaj  

TOWARDS A DETERMINATION OF DEFINITIVE PARAMETERS FOR THE LONG PERIOD CEPHEID S VULPECULAE

Odessa Astronomical Publications, 2013
A new compilation of  UBV data for stars near the Cepheid S Vul incorporates BV observations from APASS and NOMAD to augment UBV observations published previously.
D. G. Turner
doaj   +1 more source

THE DISTANCE MEASUREMENT OF NGC 1313 WITH CEPHEIDS [PDF]

The Astrophysical Journal, 2015
We present the detection of Cepheids in the barred spiral galaxy NGC 1313, using the Wide Field and Planetary Camera 2 on the Hubble Space Telescpoe. Twenty B (F450W) and V (F555W) epochs of observations spanning over three weeks were obtained, on which the profile-fitting photometry of all stars in the monitored field was performed using the package ...
Gao, Qing, Wang, Wei, Liu, Ji-Feng, Yoachim, Peter   +3 more
openaire   +2 more sources