TY - JOUR
T1 - Korean nova records in A.D. 1073 and A.D. 1074
T2 - R Aquarii
AU - Yang, Hong Jin
AU - Park, Myeong Gu
AU - Cho, Se Hyung
AU - Park, Changbom
PY - 2005/5
Y1 - 2005/5
N2 - R Aqr is known to be a symbiotic binary system with an associated extended emission nebula, possibly produced by a historic outburst. To find the associated historic records, we searched for and compiled all Guest Star and Peculiar Star records in three Korean official history books that cover almost two thousand years, Samguksagi, Goryeosa, Joseonwangjosillok. In addition to the record of A.D. 1073, previously noted by Li (1985, Chin. Astron. Astrophys., 9, 322), we have found in Goryeosa another candidate record of A.D. 1074, which has the same positional description as that of A.D. 1073 with an additional brightness description. We examined various aspects of the two records and conclude that they both are likely to be the records of outburst of R Aqr. This means that there were two successive outbursts in A.D. 1073 and in A.D. 1074, separated by approximately one year. Based on these records, we estimate the distance to R Aqr to be 273 pc if the expansion of the nebula has been at a constant rate. The brightness record of A.D. 1074 corresponds to the absolute magnitude at outburst of Woutburst = -6.2m-5.2m at this distance. The two Korean records associated with R Aqr may provide astronomically meaningful constraints to the outburst model of R Aqr and the formative process of its nebulosity.
AB - R Aqr is known to be a symbiotic binary system with an associated extended emission nebula, possibly produced by a historic outburst. To find the associated historic records, we searched for and compiled all Guest Star and Peculiar Star records in three Korean official history books that cover almost two thousand years, Samguksagi, Goryeosa, Joseonwangjosillok. In addition to the record of A.D. 1073, previously noted by Li (1985, Chin. Astron. Astrophys., 9, 322), we have found in Goryeosa another candidate record of A.D. 1074, which has the same positional description as that of A.D. 1073 with an additional brightness description. We examined various aspects of the two records and conclude that they both are likely to be the records of outburst of R Aqr. This means that there were two successive outbursts in A.D. 1073 and in A.D. 1074, separated by approximately one year. Based on these records, we estimate the distance to R Aqr to be 273 pc if the expansion of the nebula has been at a constant rate. The brightness record of A.D. 1074 corresponds to the absolute magnitude at outburst of Woutburst = -6.2m-5.2m at this distance. The two Korean records associated with R Aqr may provide astronomically meaningful constraints to the outburst model of R Aqr and the formative process of its nebulosity.
KW - History and philosophy of astronomy
KW - ISM: planetary nebulae: general
KW - Stars: binaries: Symbiotic
UR - http://www.scopus.com/inward/record.url?scp=18744383353&partnerID=8YFLogxK
U2 - 10.1051/0004-6361:20042455
DO - 10.1051/0004-6361:20042455
M3 - Article
AN - SCOPUS:18744383353
SN - 0004-6361
VL - 435
SP - 207
EP - 214
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
IS - 1
ER -