Polarization properties of R Cas SiO masers

K. A. Assaf; P. J. Diamond; A. M S Richards; M. D. Gray; R S {Booth}; W H T {Vlemmings}; E M L {Humphreys}

doi:10.1017/S1743921312007028

Polarization properties of R Cas SiO masers

K. A. Assaf, P. J. Diamond, A. M S Richards, M. D. Gray, R S {Booth} (Editor), W H T {Vlemmings} (Editor), E M L {Humphreys} (Editor)

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Silicon monoxide maser emission has been detected in the circumstellar envelopes of many evolved stars. It is a good tracer of the wind dynamics within a few stellar radii of the central star. We investigated the polarization morphology in the circumstellar envelope of an AGB star, R Cas, by using the VLBA to map the linear and circular polarization of the v=1, J=1-0 SiO maser transition during 23 epochs over two stellar cycles. The average fractional circular polarization is a few percent. The average fractional linear polarization per epoch is 11-58%, but some isolated features exceed 100%, probably because the total intensity emission is smoother and more resolved-out. The maser electric polarization vector angle has a preferrential tendency to be either parallel or perpendicular to the radial direction to the star. Copyright © International Astronomical Union 2012.

Original language	English
Title of host publication	Proceedings of the International Astronomical Union\|Proc. Int. Astron. Union
Editors	R S {Booth}, W H T {Vlemmings}, E M L {Humphreys}
Place of Publication	Cambridge, UK
Publisher	Cambridge University Press
Pages	235-239
Number of pages	4
Volume	8
ISBN (Print)	9781107032842
DOIs	https://doi.org/10.1017/S1743921312007028
Publication status	Published - Jul 2012
Event	Cosmic Masers - from OH to H0 - Stellenbosch, South Africa Duration: 29 Jan 2012 → 3 Feb 2012

Conference

Conference	Cosmic Masers - from OH to H0
City	Stellenbosch, South Africa
Period	29/01/12 → 3/02/12

Keywords

masers
polarization
star: AGB
star: late-type star: individual: R Cas.

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10.1017/S1743921312007028

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Assaf, K. A., Diamond, P. J., Richards, A. M. S., Gray, M. D., {Booth}, R. S. (Ed.), {Vlemmings}, W. H. T. (Ed.), & {Humphreys}, E. M. L. (Ed.) (2012). Polarization properties of R Cas SiO masers. In R. S. {Booth}, W. H. T. {Vlemmings}, & E. M. L. {Humphreys} (Eds.), Proceedings of the International Astronomical Union|Proc. Int. Astron. Union (Vol. 8, pp. 235-239). Cambridge University Press. https://doi.org/10.1017/S1743921312007028

@inproceedings{e4f8efeff7eb4522978159f0edfc44ec,

title = "Polarization properties of R Cas SiO masers",

abstract = "Silicon monoxide maser emission has been detected in the circumstellar envelopes of many evolved stars. It is a good tracer of the wind dynamics within a few stellar radii of the central star. We investigated the polarization morphology in the circumstellar envelope of an AGB star, R Cas, by using the VLBA to map the linear and circular polarization of the v=1, J=1-0 SiO maser transition during 23 epochs over two stellar cycles. The average fractional circular polarization is a few percent. The average fractional linear polarization per epoch is 11-58%, but some isolated features exceed 100%, probably because the total intensity emission is smoother and more resolved-out. The maser electric polarization vector angle has a preferrential tendency to be either parallel or perpendicular to the radial direction to the star. Copyright {\textcopyright} International Astronomical Union 2012.",

keywords = "masers, polarization, star: AGB, star: late-type star: individual: R Cas.",

author = "Assaf, {K. A.} and Diamond, {P. J.} and Richards, {A. M S} and Gray, {M. D.} and {Booth}, {R S} and {Vlemmings}, {W H T} and {Humphreys}, {E M L}",

year = "2012",

month = jul,

doi = "10.1017/S1743921312007028",

language = "English",

isbn = "9781107032842",

volume = "8",

pages = "235--239",

editor = "{Booth}, {R S} and {Vlemmings}, {W H T} and {Humphreys}, {E M L}",

booktitle = "Proceedings of the International Astronomical Union|Proc. Int. Astron. Union",

publisher = "Cambridge University Press",

address = "United Kingdom",

note = "Cosmic Masers - from OH to H0 ; Conference date: 29-01-2012 Through 03-02-2012",

}

Assaf, KA, Diamond, PJ, Richards, AMS, Gray, MD, {Booth}, RS (ed.), {Vlemmings}, WHT (ed.) & {Humphreys}, EML (ed.) 2012, Polarization properties of R Cas SiO masers. in RS {Booth}, WHT {Vlemmings} & EML {Humphreys} (eds), Proceedings of the International Astronomical Union|Proc. Int. Astron. Union. vol. 8, Cambridge University Press, Cambridge, UK, pp. 235-239, Cosmic Masers - from OH to H0, Stellenbosch, South Africa, 29/01/12. https://doi.org/10.1017/S1743921312007028

Polarization properties of R Cas SiO masers. / Assaf, K. A.; Diamond, P. J.; Richards, A. M S et al.
Proceedings of the International Astronomical Union|Proc. Int. Astron. Union. ed. / R S {Booth}; W H T {Vlemmings}; E M L {Humphreys}. Vol. 8 Cambridge, UK: Cambridge University Press, 2012. p. 235-239.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Polarization properties of R Cas SiO masers

AU - Assaf, K. A.

AU - Diamond, P. J.

AU - Richards, A. M S

AU - Gray, M. D.

A2 - {Booth}, R S

A2 - {Vlemmings}, W H T

A2 - {Humphreys}, E M L

A2 - {Booth}, R S

A2 - {Vlemmings}, W H T

A2 - {Humphreys}, E M L

PY - 2012/7

Y1 - 2012/7

N2 - Silicon monoxide maser emission has been detected in the circumstellar envelopes of many evolved stars. It is a good tracer of the wind dynamics within a few stellar radii of the central star. We investigated the polarization morphology in the circumstellar envelope of an AGB star, R Cas, by using the VLBA to map the linear and circular polarization of the v=1, J=1-0 SiO maser transition during 23 epochs over two stellar cycles. The average fractional circular polarization is a few percent. The average fractional linear polarization per epoch is 11-58%, but some isolated features exceed 100%, probably because the total intensity emission is smoother and more resolved-out. The maser electric polarization vector angle has a preferrential tendency to be either parallel or perpendicular to the radial direction to the star. Copyright © International Astronomical Union 2012.

AB - Silicon monoxide maser emission has been detected in the circumstellar envelopes of many evolved stars. It is a good tracer of the wind dynamics within a few stellar radii of the central star. We investigated the polarization morphology in the circumstellar envelope of an AGB star, R Cas, by using the VLBA to map the linear and circular polarization of the v=1, J=1-0 SiO maser transition during 23 epochs over two stellar cycles. The average fractional circular polarization is a few percent. The average fractional linear polarization per epoch is 11-58%, but some isolated features exceed 100%, probably because the total intensity emission is smoother and more resolved-out. The maser electric polarization vector angle has a preferrential tendency to be either parallel or perpendicular to the radial direction to the star. Copyright © International Astronomical Union 2012.

KW - masers

KW - polarization

KW - star: AGB

KW - star: late-type star: individual: R Cas.

U2 - 10.1017/S1743921312007028

DO - 10.1017/S1743921312007028

M3 - Conference contribution

SN - 9781107032842

VL - 8

SP - 235

EP - 239

BT - Proceedings of the International Astronomical Union|Proc. Int. Astron. Union

PB - Cambridge University Press

CY - Cambridge, UK

T2 - Cosmic Masers - from OH to H0

Y2 - 29 January 2012 through 3 February 2012

ER -

Assaf KA, Diamond PJ, Richards AMS, Gray MD, {Booth} RS, (ed.), {Vlemmings} WHT, (ed.) et al. Polarization properties of R Cas SiO masers. In {Booth} RS, {Vlemmings} WHT, {Humphreys} EML, editors, Proceedings of the International Astronomical Union|Proc. Int. Astron. Union. Vol. 8. Cambridge, UK: Cambridge University Press. 2012. p. 235-239 doi: 10.1017/S1743921312007028

Polarization properties of R Cas SiO masers

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