2018ApJ...859..137C

Query : 2018ApJ...859..137C

2018ApJ...859..137C - Astrophys. J., 859, 137-137 (2018/June-1)

An extremely low mid-infrared extinction law toward the Galactic Center and 4% distance precision to 55 classical Cepheids.

CHEN X., WANG S., DENG L. and DE GRIJS R.

Abstract (from CDS):

Distances and extinction values are usually degenerate. To refine the distance to the general Galactic Center region, a carefully determined extinction law (taking into account the prevailing systematic errors) is urgently needed. We collected data for 55 classical Cepheids projected toward the Galactic Center region to derive the near- to mid-infrared extinction law using three different approaches. The relative extinction values obtained are AJ/AKs=3.005,AH/AKs=1.717, A[3.6]/AKs=0.478,A[4.5]/AKs=0.341, A[5.8]/AKs=0.234,A[8.0]/AKs=0.321,AW1/AKs_=0.506, and AW2/AKs_=0.340. We also calculated the corresponding systematic errors. Compared with previous work, we report an extremely low and steep mid-infrared extinction law. Using a seven-passband "optimal distance" method, we improve the mean distance precision to our sample of 55 Cepheids to 4%. Based on four confirmed Galactic Center Cepheids, a solar Galactocentric distance of R0 = 8.10 ± 0.19 ± 0.22 kpc is determined, featuring an uncertainty that is close to the limiting distance accuracy (2.8%) for Galactic Center Cepheids.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): distance scale - dust, extinction - Galaxy: bulge - Galaxy: center - infrared: stars - stars: variables: Cepheids

Simbad objects: 59

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Number of rows : 59
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Orion Molecular Cloud MoC 05 56 -01.8           ~ 1227 1
2 2MASS J17201463-3711159 cC* 17 20 14.635 -37 11 15.99           ~ 6 0
3 [MFB2016] 2 cC* 17 20 18.26 -36 58 52.8           ~ 4 0
4 [DMM2015] 2 cC* 17 21 16.05 -36 43 25.2           ~ 5 0
5 [DMM2015] 27 cC* 17 22 10.10 -36 44 18.8           ~ 5 0
6 [DMM2015] 1 cC* 17 22 23.24 -36 21 41.5           ~ 5 0
7 [MFB2016] 3 cC* 17 24 12.58 -36 01 46.9           ~ 4 0
8 [DMM2015] 5 cC* 17 25 29.70 -34 45 45.9           ~ 5 0
9 [DMM2015] 28 cC* 17 26 00.10 -35 15 15.0           ~ 5 0
10 [MFB2016] 4 cC* 17 26 34.72 -35 16 24.1           ~ 7 0
11 VVV J172643.40-345825.65 cC* 17 26 43.41 -34 58 25.6           ~ 6 0
12 [DMM2015] 7 cC* 17 26 54.24 -35 01 08.2           ~ 6 0
13 [DMM2015] 9 cC* 17 28 15.86 -34 32 27.2           ~ 5 0
14 OGLE BLG-CEP-121 cC* 17 29 59.1700417560 -34 09 55.072929348         19.297 ~ 7 0
15 [DMM2015] 8 cC* 17 30 46.64 -34 09 04.4           ~ 5 0
16 2MASS J17321405-3323589 cC* 17 32 14.060 -33 23 58.97           ~ 6 0
17 [DMM2015] 11 cC* 17 36 44.46 -32 04 38.6           ~ 5 0
18 [DMM2015] 10 cC* 17 38 42.96 -31 44 55.7           ~ 5 0
19 [MFB2016] 8 cC* 17 38 46.14 -31 26 22.8           ~ 4 0
20 [DMM2015] 31 cC* 17 40 24.58 -31 01 32.9           ~ 5 0
21 [DMM2015] 13 cC* 17 40 25.15 -31 04 50.5           ~ 4 0
22 [MFB2016] 9 cC* 17 40 41.03 -30 41 38.6           ~ 4 0
23 [DMM2015] 12 cC* 17 40 41.72 -30 48 46.9           ~ 5 0
24 [DMM2015] 30 cC* 17 40 51.51 -30 24 53.2           ~ 5 0
25 [DMM2015] 15 cC* 17 41 15.13 -30 07 17.7           ~ 5 0
26 [DMM2015] 14 cC* 17 42 20.00 -30 14 50.7           ~ 6 0
27 [MKN2011] d Ce* 17 44 56.91 -29 13 33.8           ~ 6 0
28 2MASS J17453089-2903105 cC* 17 45 30.89928 -29 03 10.5840           ~ 8 0
29 2MASS J17453227-2902555 cC* 17 45 32.280 -29 02 55.51           ~ 8 0
30 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
31 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4970 3
32 2MASS J17460602-2846550 cC* 17 46 06.02088 -28 46 55.0560           ~ 8 0
33 [DMM2015] 18 cC* 17 49 41.42 -27 27 14.6           ~ 6 0
34 [FPF2021] 52 4 1 cC* 17 50 11.2608 -27 19 42.888           ~ 5 0
35 [DMM2015] 32 cC* 17 50 17.54 -27 08 13.3           ~ 5 0
36 2MASS J17503049-2713464 cC* 17 50 30.496 -27 13 46.45           ~ 6 0
37 [DMM2015] 16 cC* 17 51 05.72 -26 38 18.3           ~ 5 0
38 2MASS J17511373-2648560 cC* 17 51 13.739 -26 48 56.01           ~ 6 0
39 [DMM2015] 22 cC* 17 51 43.80 -26 31 11.3           ~ 4 0
40 2MASS J17522167-2631193 cC* 17 52 21.672 -26 31 19.31           ~ 6 0
41 [MFB2016] 19 cC* 17 52 28.94 -26 23 40.0           ~ 4 0
42 [MFB2016] 20 cC* 17 52 38.14 -26 19 43.3           ~ 4 0
43 [DMM2015] 20 cC* 17 53 16.07 -26 28 26.9           ~ 4 0
44 2MASS J17544024-2534395 cC* 17 54 40.248 -25 34 39.51           ~ 6 0
45 [DMM2015] 33 cC* 17 55 24.20 -25 30 22.3           ~ 5 0
46 [DMM2015] 23 cC* 17 55 44.68 -25 00 30.2           ~ 5 0
47 [DMM2015] 35 cC* 17 56 01.96 -25 15 44.9           ~ 5 0
48 [MFB2016] 22 cC* 17 57 31.41 -24 30 26.7           ~ 4 0
49 [DMM2015] 24 cC* 17 58 26.68 -23 52 08.3           ~ 5 0
50 VVV J180124.48-225444.63 cC* 18 01 24.49 -22 54 44.6           ~ 7 0
51 VVV J180125.08-225428.31 cC* 18 01 25.09 -22 54 28.3           ~ 7 0
52 [MFB2016] 25 cC* 18 02 14.85 -22 27 10.6           ~ 5 0
53 [MFB2016] 26 cC* 18 03 29.93 -22 03 22.5           ~ 4 0
54 [DMM2015] 25 cC* 18 03 31.12 -22 21 14.0           ~ 4 0
55 [MFB2016] 27 cC* 18 03 53.95 -21 58 11.7           ~ 4 0
56 [MFB2016] 28 cC* 18 05 52.84 -21 06 42.0           ~ 5 0
57 [MFB2016] 29 cC* 18 07 07.82 -20 34 50.1           ~ 4 0
58 [DMM2015] 26 cC* 18 09 14.03 -20 03 21.4           ~ 5 0
59 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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