1997A&A...322..751L

Query : 1997A&A...322..751L

1997A&A...322..751L - Astronomy and Astrophysics, volume 322, 751-755 (1997/6-3)

Procedure to find <B>, <R> and <I> for Cepheids from isolated observations using the complete light curve in V.

LABHARDT L., SANDAGE A. and TAMMANN G.A.

Abstract (from CDS):

The successful discovery of Cepheids in nearby galaxies with HST has triggered the development of a both simple and effective method to determine mean magnitudes from a few scattered measurements in combination with the complete light curve observed in V. Based on the empirically derived variation of the scaled difference of magnitude deflections at two passbands with phase, correction values are obtained to transfer the complete light curve in V into light curves in B, R and I, respectively. Applied to isolated observations, the procedure yields a mean magnitude for each phase point observed at that passband. With three to four measurements, the accuracy of the final mean magnitude obtained for Cepheids with normal light curves is comparable to the value obtained from complete light curves.

Abstract Copyright: ∼

Journal keyword(s): methods: data analysis - techniques: photometric - stars: fundamental parameters - Cepheids

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 925 H2G 02 27 16.913 +33 34 43.97   10.69 10.12 9.55   ~ 783 1
2 V* T Mon cC* 06 25 12.9996760920 +07 05 08.558582892 8.24 7.20 5.98   4.996 G3Iabv+A0p 464 1
3 V* W Gem cC* 06 34 57.4524971712 +15 19 49.696329540 7.79 7.25 6.54   5.908 F5-G1 213 0
4 * zet Gem cC* 07 04 06.5312384690 +20 34 13.074474962 5.20 4.58 3.79   3.082 G1Ib 569 0
5 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4449 3
6 M 95 GiP 10 43 57.7313485800 +11 42 13.301191332 10.71 10.51 9.73 9.48   ~ 1121 2
7 M 96 GiP 10 46 45.744 +11 49 11.78 10.42 10.15 9.25 8.99   ~ 819 1
8 M 100 AGN 12 22 54.9299993592 +15 49 20.296257960 10.04 10.05 9.35     ~ 1845 2
9 NGC 4414 GiG 12 26 27.1276893168 +31 13 24.626206488 11.12 10.96 10.12     ~ 566 2
10 NGC 4505 GiP 12 31 39.2222392512 +03 56 21.641352828   11.71       ~ 351 0
11 NGC 4536 GiP 12 34 27.1 +02 11 18 11.14 11.16 10.55 17.393   ~ 852 3
12 NGC 4639 GiP 12 42 52.3785000336 +13 15 26.706153600   13.62 12.72     ~ 610 0
13 IC 4182 BiC 13 05 48.7478324064 +37 36 12.965157684   11.86   11.40   ~ 336 1
14 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33 13.47 ~ 1365 4
15 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2914 2
16 V* Y Oph cC* 17 52 38.7019050072 -06 08 36.874071816 8.62 7.61 6.21     G3Ia 364 0
17 V* SU Cyg cC* 19 44 48.7341456312 +29 15 52.895535048 7.10 6.88 6.44 6.06 5.84 F2Iab:+B8.0V 299 0
18 * del Cep cC* 22 29 10.2626640314 +58 24 54.697613650 4.71 4.35 3.75   3.219 F5Iab:+B7-8 730 0

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