2016AJ....152..200M


Query : 2016AJ....152..200M

2016AJ....152..200M - Astron. J., 152, 200-200 (2016/December-0)

A search for mass loss on the cepheid instability strip using H I 21 cm line observations.

MATTHEWS L.D., MARENGO M. and EVANS N.R.

Abstract (from CDS):

We present the results of a search for H i 21 cm line emission from the circumstellar environments of four Galactic Cepheids (RS Pup, X Cyg, ζ Gem, and T Mon) based on observations with the Karl G. Jansky Very Large Array. The observations were aimed at detecting gas associated with previous or ongoing mass loss. Near the long-period Cepheid T Mon, we report the detection of a partial shell-like structure whose properties appear consistent with originating from an earlier epoch of Cepheid mass loss. At the distance of T Mon, the nebula would have a mass (H i+He) of ∼0.5M, or ∼6% of the stellar mass. Assuming that one-third of the nebular mass comprises swept-up interstellar gas, we estimate an implied mass-loss rate of \dotM∼(0.6–2)×10–5 M yr–1. No clear signatures of circumstellar emission were found toward ζ Gem, RS Pup, or X Cyg, although in each case, line-of-sight confusion compromised portions of the spectral band. For the undetected stars, we derive model-dependent 3σupper limits on the mass-loss rates, averaged over their lifetimes on the instability strip, of \lesssim(0.3–6)×10–6 M yr–1 and estimate the total amount of mass lost to be less than a few percent of the stellar mass.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): circumstellar matter - radio lines: stars - stars: mass-loss - stars: variables: Cepheids - stars: variables: Cepheids

Simbad objects: 12

goto Full paper

goto View the references in ADS

Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2606 2
2 * alf UMi cC* 02 31 49.09456 +89 15 50.7923 3.00 2.62 2.02 1.53 1.22 F8Ib 629 2
3 V* T Mon cC* 06 25 12.9997562821 +07 05 08.561189768 8.24 7.20 5.98   4.996 G3Iabv+A0p 451 1
4 4C 10.20 Rad 06 32 15.30 +10 22 02.0           ~ 33 1
5 * zet Gem cC* 07 04 06.5307903 +20 34 13.073871 5.20 4.58 3.79   3.082 G1Ib 543 0
6 QSO J0738+1742 BLL 07 38 07.39374766 +17 42 18.9982302   16.76 16.22 15.78   ~ 909 1
7 V* RS Pup cC* 08 13 04.2157137938 -34 34 42.691837063 8.89 8.51 7.04   5.453 F8Iab 328 0
8 QSO B0826-373 QSO 08 28 04.78022012 -37 31 06.2809892   16       ~ 48 0
9 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825107   17.51 17.25     ~ 3891 2
10 V* X Cyg cC* 20 43 24.1918662954 +35 35 16.075732392 8.69 7.70 6.47   5.241 F7Ib 445 0
11 ICRF J205252.0+363535 Sy2 20 52 52.0549923 +36 35 35.300002   22.083   21.200   ~ 94 1
12 * del Cep cC* 22 29 10.2650184 +58 24 54.713856 4.71 4.35 3.75   3.219 F5Iab:+B7-8 692 0

To bookmark this query, right click on this link: simbad:objects in 2016AJ....152..200M and select 'bookmark this link' or equivalent in the popup menu


2021.08.04-15:44:06

© Université de Strasbourg/CNRS

    • Contact