1997A&A...318..416P


Query : 1997A&A...318..416P

1997A&A...318..416P - Astronomy and Astrophysics, volume 318, 416-428 (1997/2-2)

Rotation of the outer disc from classical cepheids.

PONT F., QUELOZ D., BRATSCHI P. and MAYOR M.

Abstract (from CDS):

Radial velocities and distances have been measured for a sample of 48 remote classical cepheids located in the outer disc of the Galaxy (118deg<l<274deg). The distances are determined from BVI photometry, with semi-empirical metallicity corrections calibrated on the Magellanic Clouds. Using these cepheids as tracers, the rotation curve of the disc is determined between R0 and 2R0. The result is a flat rotation curve about 30km/s lower than theta0, Vrot=193±4km/s for R0≡8.5kpc and theta0=220kms/s assumed, or Vrot=167±4km/s for R0=8kpc and theta0=200km/s. The possible presence of non-axisymmetric components in the rotation of the outer disc is considered. We find a very small or vanishing value for any radial motion of the LSR or expansion/contraction motion. In particular, the data exclude large radial motions such as have been proposed in some models to account for features observed in the kinematics of the gas. The rotation curve indicated by cepheids is markedly lower than that currently derived using HII regions. Possible explanations are examined. A real kinematical difference is possible, caused for instance by radial motions in the gas induced by spiral arms, but an important distance scale difference is not excluded. A systematic error added to a high dispersion on HII region distances could explain the mismatch.

Abstract Copyright:

Journal keyword(s): stars: distance - kinematics - cepheids - Galaxy: kinematics and dynamics

VizieR on-line data: <Available at CDS (J/A+A/318/416): coravel elodie photom>

Simbad objects: 51

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Number of rows : 51
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* BF Cas cC* 00 14 03.2290682280 +60 59 10.556798892   13.74 12.47     ~ 37 0
2 V* FO Cas cC* 00 17 02.5025659440 +60 48 10.101619836   15.67 14.00     ~ 28 0
3 V* CT Cas cC* 00 20 03.0752663760 +63 10 47.258360112   13.58 12.35     ~ 28 0
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10194 1
5 V* IO Cas cC* 01 47 02.7160001136 +59 36 22.526231904   14.84       ~ 34 0
6 V* CI Per cC* 02 05 02.1930621912 +57 08 34.564628940           ~ 35 0
7 V* UX Per cC* 02 13 07.4861939616 +58 04 47.828042508   12.14 11.26     F5 84 0
8 V* LT Cas cC* 02 45 51.4922663880 +63 18 16.463338488   13.76       ~ 33 0
9 V* AD Cam cC* 03 29 25.9697779560 +60 26 47.271788232   14.16       ~ 50 0
10 V* GP Per cC* 04 23 19.1738872632 +44 14 12.741125964   13.40 14.20     ~ 25 0
11 V* HZ Per cC* 04 25 37.2943794720 +45 37 13.143585216   15.89       ~ 40 0
12 V* BM Per cC* 04 29 39.3890067672 +48 25 19.101057240   11.56 10.06     K5 68 0
13 V* OT Per cC* 04 38 37.9383938232 +47 44 25.007509824   15.71 13.47     ~ 41 0
14 V* HQ Per cC* 04 43 57.8808060360 +40 50 05.208755244           F 39 0
15 V* SV Per cC* 04 49 47.9416107648 +42 17 22.981906464   9.74 8.86     F6-G1 144 0
16 V* EW Aur cC* 04 51 24.8479881912 +38 11 18.786824628   14.60       ~ 45 0
17 V* FF Aur cC* 04 55 18.1146521520 +39 58 46.982198784           ~ 37 0
18 V* CY Aur cC* 04 57 40.0812707448 +46 05 33.111246264   13.44 12.04     ~ 54 0
19 V* YZ Aur cC* 05 15 21.9827588256 +40 04 40.880491572   11.77 10.24     G5 101 0
20 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15990 1
21 V* AS Aur cC* 06 05 24.4364647728 +28 47 22.937441136   12.34 11.75     F6 27 0
22 V* CR Ori cC* 06 05 44.7233978880 +13 14 23.956079280   12.97     10.931 F7 50 0
23 V* AA Gem cC* 06 06 34.9460908656 +26 19 45.202120572   11.0 9.91   8.540 K0 117 0
24 V* CS Ori cC* 06 07 25.4652889368 +11 09 07.112104380   11.96 11.29   10.239 F5 77 0
25 V* BW Gem cC* 06 15 59.8872211464 +23 44 50.973410796   13.18 12.01 11.66   ~ 33 0
26 V* FT Mon cC* 06 21 36.0794129472 +04 04 24.841341696   11   12.23 11.496 ~ 41 0
27 V* VZ Mon cC* 06 31 14.5473360048 +11 51 01.244676636   15.20 13.658   11.636 ~ 29 0
28 V* CU Mon cC* 06 32 46.7955717384 +00 02 35.314789524   15.02     11.923 ~ 49 0
29 V* WW Mon cC* 06 33 37.1818495320 +09 12 12.839048964   13.65 12.492   11.155 F6 62 0
30 V* V495 Mon cC* 06 37 03.3840074280 -02 49 26.758525188   13.69       ~ 43 0
31 V* V447 Mon cC* 06 44 15.9970884360 +04 29 54.219400800     14.132   12.297 ~ 29 0
32 V* V508 Mon cC* 06 47 09.4000203792 +03 58 01.551642816   11.50 10.53     ~ 70 0
33 V* V510 Mon cC* 06 47 26.9329047264 +02 31 01.442143992   14.13 12.645   10.858 ~ 38 0
34 V* TW Mon cC* 06 50 32.3363025960 +00 00 25.184213748     12.552   10.939 ~ 47 0
35 V* EE Mon cC* 06 50 48.6825989856 -07 58 50.633343948   14.03 13.06   11.724 ~ 47 0
36 V* TX Mon cC* 06 50 52.2684114720 -01 25 45.228530964   11.76 10.67   9.619 F6 94 0
37 V* XX Mon cC* 06 52 12.1699411584 -02 48 25.052904036   12.81 11.52     F6 71 0
38 V* YY Mon cC* 06 54 11.4372828072 -07 39 51.771167496   14.85 13.677   12.381 ~ 30 0
39 V* AA Mon cC* 06 57 23.7697706784 -03 50 36.027965220   14.07 12.740   11.081 ~ 49 0
40 V* TZ Mon cC* 06 58 00.9347733216 -00 22 33.463232040   11.8       F6 87 0
41 V* FG Mon cC* 07 07 08.5490458896 -07 47 42.472835376   14.44 13.182   11.720 ~ 44 0
42 V* FI Mon cC* 07 10 37.9924060392 -07 07 22.462189320   14.07 12.900   11.578 ~ 48 0
43 V* AO CMa cC* 07 24 40.5916030536 -26 11 18.607940988           ~ 30 0
44 V* CK Pup cC* 07 27 18.8848961136 -25 47 07.307024892         11.655 ~ 27 0
45 V* BC Pup cC* 07 30 02.5524981312 -23 40 26.365025028     13.841   12.247 ~ 28 0
46 V* VW Pup cC* 07 31 49.0895527488 -20 08 58.801627752   12.12 11.15     F5 73 0
47 V* VZ Pup cC* 07 38 35.2380326136 -28 29 58.597431036   11.469 10.154 9.583   F7.5 141 1
48 V* WW Pup cC* 07 41 54.8902435968 -21 07 59.053661364   11.36 10.53     F5 76 0
49 V* HW Pup cC* 07 57 42.1676229600 -27 36 06.842167056   13.35 12.018   10.51 ~ 53 0
50 V* WY Pup cC* 07 58 05.1407536896 -24 02 30.362394660   11.61 10.87     F7 67 0
51 V* EZ Vel cC* 09 25 07.3812847680 -53 12 35.561325060     12.61     ~ 44 0

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2022.05.22-12:28:04

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