SIMBAD references

2003ApJ...588L.105P - Astrophys. J., 588, L105-L108 (2003/May-2)

R Cassiopeiae: relative strengths of SiO masers at 43 and 86 GHz.


Abstract (from CDS):

We present simultaneous VLBI maps of the J=1⟶0 (43.1 GHz) and J=2⟶1 (86.2 GHz) silicon monoxide (SiO) v=1 masers in the circumstellar envelope of the asymptotic giant branch star R Cassiopeiae that have been registered to submilliarcsecond precision. Our images allow specific comparisons of maser strengths from volumes that are about 1/10 AU in projected size. Bright 86.2 GHz v=1 masers in two cases operate from the same gas volumes as the 43.1 GHz v=1 masers. The relative strengths of the 43.1 and 86.2 GHz masers vary from roughly unity to lower limits of several hundred to 1. The low strength of J=2⟶1 masers relative to J=1⟶0 might arise from neutral densities of H2≤4x109 cm–3 at 1.5-2 times the photospheric radius from R Cas. The SiO masers of R Cas at this epoch are not consistent with emission models that employ pulsation-driven shocks unless the phasing of such models can be shifted.

Abstract Copyright:

Journal keyword(s): Stars: Circumstellar Matter - Radio Lines: Stars - Stars: AGB and Post-AGB - Techniques: Interferometric

CDS comments: SiO maser = [WCP90] 235552.000+510637.76, masers clumps A to D not in SIMBAD.

Simbad objects: 5

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