Near‐infrared photometry of carbon stars★

By P. Whitelock, M. Feast, F. Marang, M. Groenewegen. 2006

142 citations recorded by the source corpus.

Near-infrared, JHKL, photometry of 239 Galactic carbon-rich variable stars is presented and discussed. From these and published data the stars were classified as Mira or non-Mira variables and amplitudes and pulsation periods, ranging from 222 to 948 days for the Miras, were determined for most of them. A comparison of the colour and period relations with those of similar stars in the Large Magellanic Cloud indicates minor differences, which may be the consequence of sample selection effects. Apparent bolometric magnitudes were determined by combining the mean JHKL fluxes with mid-infrared photometry from IRAS and MSX. Then, using the Mira period luminosity relation to set the absolute magnitudes, distances were determined – to greater accuracy than has hitherto been possible for this type of star. Bolometric corrections to the K magnitude were calculated and prescriptions derived for calculating these from various colours. Mass-loss rates were also calculated and compared to values in the literature. Approximately one third of the C-rich Miras and an unknown fraction of the non-Miras exhibit apparently random obscuration events that are reminiscent of the phenomena exhibited by the hydrogen deficient RCB stars. The underlying cause of this is unclear, but it may be that mass loss, and consequently dust formation, is very easily triggered from these very extended atmospheres.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/cc3a2d71995dae48b3cb38438fa80f7faa56e83f

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In Astronomy and Astrophysics

1. A. Karakas
2. S. Bisterzo
3. Roberto Gallino
4. S. Cristallo
5. M. Lugaro
6. O. Straniero
7. P. Whitelock
8. C. Abia

In Instrumentation

1. P. Whitelock
2. M. Feast
3. A. Karakas
4. A. Zijlstra
5. F. V. Leeuwen
6. O. Straniero
7. S. Bisterzo
8. S. Cristallo

Citations in the corpus

• Mass loss of stars on the asymptotic giant branch (2018, background): “Examples of colour estimates are relations between dust-mass-loss rate and K–[12] (Whitelock et al. 2006), K–[8] and K–[24] (Matsuura et al. 2013), [6.4]–[9.3] (Groenewegen et al. 2007), and [3.6]–[8.0] (Matsuura et al. 2013; Reiter et al. 2015), where [12] is the IRAS 12µm flux while the rest are…”
• EVOLUTION, NUCLEOSYNTHESIS, AND YIELDS OF LOW-MASS ASYMPTOTIC GIANT BRANCH STARS AT DIFFERENT METALLICITIES (2009, methodology): “…et al. 2007) and of IR data from the ISO and MSX missions or, secondly, from the period-Luminosity relation for Mira C-rich sources published in Whitelock et al. (2006) (see Guandalini et al. 2006 and Guandalini & Busso 2008 for the technical – 39 – – 40 – procedure followed to construct the…”
• AGB variables and the Mira period–luminosity relation (2008, background): “For the C-rich stars it is actually very difficult to distinguish between Miras and non Miras (see also Whitelock et al. 2006).”
• The global gas and dust budget of the Large Magellanic Cloud: AGB stars and supernovae, and the impact on the ISM evolution (2009, background): “The amplitudes of the infrared variability are smaller than those of optical variabilities: they range from 0.2 to 1.5 mag at L band (3 μm) (Le Bertre 1992; Whitelock et al. 2006).”