Hatena::Groupkanatatmp

KANATA ObsLog

2009-01-27

[]PKS 0048-097 : brightening

f:id:kanataobslog:20090127094356p:image

The figure shows the light curve and the polarization degree in V band of PKS 0048-097.

The flux of the object has increased these days with an increasing of the polarization degree.

[]3C 279 : update the data

f:id:kanataobslog:20090127094250p:image

We update the data of 3C 279. The figure shows the light curve and the polarization degree in V band of the object.

The object has still high polarization degree.

2009-01-23

[] Photometric observations of Type Ia SN 2008hy

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f:id:kanataobslog:20090123094423p:image

We have performed multi-color photometric observations of Type Ia supernova. The preliminary recent photometric results shows that SN 2008hy is normal SN Ia like SN 1996X (Salvo et al. 2001), unlike the peculiar subluminous object SN 1991bg. We also showed color evolution of this object. The results of color evolutions indicated that SN 2008hy is normal SN Ia in consistent with the photometric results. We will continue observations.

2009-01-22

[] The spectrum of Type Ic SN 2007gr at late phase

f:id:kanataobslog:20090122214705p:image

We obtained spectra of SN 2007gr in Mar. 31 2008. We compared this spectra with that obtained at 140 days after maximum of Type IIb SN 2008ax. The each spectrum is calibrated the recession velocity of the host galaxy, respectively. The spectrum shows OI6300 and CaII7300 forbidden line. The OI line of SN 2007gr is narrower than that of SN 2008ax. The CaII line profile seems to has the triplet structure.

2009-01-19

[]3C 66A : brightening

f:id:kanataobslog:20090120010806p:image

The flux of the object has increased since JD 2454820 but the polarization degree is low.

[]AO 0235+164 : update the data

f:id:kanataobslog:20090120010707p:image

The figure shows the light curve in V band and the V-J color of AO 0235+164.

The flux of the object has decreased but the color has not vary so much.

[]1ES 0323+022 : update the data

f:id:kanataobslog:20090120010555p:image

We update the data of 1ES 0323+022. The object does not vary so much.

[] Optical observations of Type IIP SN 2008in in M61

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f:id:kanataobslog:20090119234436p:image

We performed optical observations of Type IIP SN 2008in. The light curve shows that SN 2008in is in first decline phase. The spectra shows typical characteristics of Type II-plateau supernova. The H_alpha emission line is dominated in the spectra, as the feature of SN 2008ij. We will continue observe SN 2008in.

2009-01-17

[] Optical observations of Type IIP SN 2008ij

f:id:kanataobslog:20090118002414p:image

f:id:kanataobslog:20090118002415p:image

We have performed spectroscopic and photometric observations of Type IIP SN 2008ij since Dec. 25 2008. The increasing V,R,Ic light curve indicates that SN 2008ij have been evolved in the diffusion phase. The slow decline decay of B-band light curve has seen until Day 20. After Day 20, the decline rate becomes large.

The first and second spectra showed only Hydrogen line and underlying continuum. Thereafter, the spectra taken in Jan. 13 comes to see Calcium at 8500A, respectively. The hydrogen line absorption deepen as time evolved, and the feature began to show P-Cyg profile. The spectra characteristics indicates that SN 2008ij is Type IIP SN in early phase. We will continue to observe this object.

2009-01-16

[]S2 0109+224 : update the data

f:id:kanataobslog:20090117010508p:image

The figure shows the light curve and the polarization degree in V band of the object. The polarization degree is still low.

[] PKS 0048-097 : periodic variation ??

f:id:kanataobslog:20090117010344p:image

We update the data of PKS 0048-097.

The figure shows the light curve and the polarization degree in V band of the object. The flux of the object seems to vary periodically.

2009-01-15

[]PKS 0754+100 : update the data

f:id:kanataobslog:20090116012132p:image

The flux of the object has increased by about 2 mag. on JD 2454835 since JD 2454776. Recently, the object tends to be fading.

[]OJ 49 : update the data

f:id:kanataobslog:20090116011949p:image

We report the observation of OJ 49.

The polarization degree has increased and after that has decreased but the flux did not vary so much.

2009-01-14

[]ON 325 : update the data

f:id:kanataobslog:20090115014807p:image

We update the data of ON 325. The figure shows the light curve in V band and the V-J color of the object.

[]3C 66A : update the data

f:id:kanataobslog:20090115014531p:image

We update the data of 3C 66A. The flux and the polarization degree have decreased slowly.

2009-01-13

[]3C 279 : increasing of the polarization degree

f:id:kanataobslog:20090113170711p:image

We are performing the observation of 3C 279. The polarization degree has increased over 35 %.

This is the highest polarization degree in our monitoring blazar.

[]QSO 0133+476 : rebrightening??

f:id:kanataobslog:20090113170546p:image

The figure shows the light curve and the polarization degree in V band of the object.

In these days, the flux has increased by about 0.2 mag. but the polarization degree continues to decrease.

[]OJ 287 : high polarization degree

f:id:kanataobslog:20090113170431p:image

We update the data of OJ 287. The object has still the high

polarization degree but the flux doesn't vary larger than 0.1 mag..

2009-01-09

[]OJ 287 : update the data

f:id:kanataobslog:20090110011716p:image

The figure shows the light curve and the polarization degree of object in V band. The polarization degree has increased since JD 2454823.

[]3C 371 : update the data

f:id:kanataobslog:20090110011543p:image

We update the data of 3C 371. The figure shows the light curve and the polarization degree of object in V band.

[] V5579 Sgr : Dust formation in its early phase of the eruption

V5579 Sgr (= Nova Sagittarii 2008 #1) was discovered on 2008 April 18 by K. Nishiyama

and F. Kabashima at 8.4 mag (IAUC 8937 ). We started photometric observations of the

nova in B--Ks bands using TRISPEC just after the IAUC alert. The object reached the

maximum on ~JD 2454580.

f:id:kanataobslog:20090109194234p:image

The figure shows our V- and Ks-band light curves during its early phase of 180 days.

The Ks-band light curve shows a "bump" around JD 2454600, although the V-band flux

keeps the steep fading after the maximum. This indicates the occurrence of the dust

formation in V5579 Sgr. We, therefore, conclude that the dust formation had already

occurred on JD 2454600 in the nova system.

The dust forming event in V5579 Sgr occurred <20 days (probably ~15 days) after the

maximum. This duration is quite shorter than that of general dust-forming novae, which

have the duration of > 30 days. An analogous dust-framing nova is V1280 Sco.

The post nova experienced the dust formation within only ~10 days after the visual maximum.

V1280 Sco formed the clumpy dust shell in its very early phase of the dust formation

(Das et al. 2008, MNRAS, 391, 1874 ).

Our latest observation of V5579 Sgr indicates that the Ks-band flux from the dust shells

seems to be stable around Ks~8. The flux in V of the nova were detected at ~17.7 for the

first time in 130 days. The detection in the V-band may indicates that the optical flux

returned from deep minimum due to the dust absorption. Further optical and infrared

observations are required to study of the evolution of the dust shell.

2009-01-08

[] S5 0716+714 : update the data

f:id:kanataobslog:20090108233442p:image

The figure shows the light curve and the polarization degree of the object in V band. We detect the large flare of the polarization degree but there is no large flare of the flux.

[] PKS 0422+004 : light curve and color

f:id:kanataobslog:20090108233341p:image

The figure shows the light curve in V band and the V-J color of the object. The color seems to become bluer when the object brighter.

2009-01-07

[]S2 0109+224 : update the data

f:id:kanataobslog:20090108010709p:image

We update the data of S2 0109+224. The V-J color has been bluer since JD 2454824.

[]3C 454.3 : update the data

f:id:kanataobslog:20090108010612p:image

The figure shows the light curve and the polarization degree of the object in V band. The flux has decreased while the polarization degree keeps a low level.

[]1ES 1959+650 : detection of flare

f:id:kanataobslog:20090107070458p:image

The figure shows the light curve and the polarization degree of the object in V band. We detect a small flare which has amplitude of 0.3mag. but the polarization degree does not correlate with a flare.

[]3C 66A : update the data

f:id:kanataobslog:20090107070325p:image

We update the data of 3C 66A. The flux and the polarization degree show oscillations superimposed on a gradualy decreasing trend. The correalation between the flux and the polarization degree is not clear.

[]Mrk 421 : the light curve and the polarization

f:id:kanataobslog:20090107070206p:image

The figure shows the light curve and the polarization degree of Mrk 421 in V band. The object does not has high polarization degree.

[]OJ 49 : the light curve and the polarization

f:id:kanataobslog:20090107070042p:image

The figure shows the light curve and the polarization degree of OJ 49 in V band. The flux has decreased but the polarization degree has increased.

[]ON 231 : the light curve and the polarization

f:id:kanataobslog:20090107065908p:image

We are monitoring of ON 231. The figure shows the light curve and the polarization degree.

[]ON 325 : update the data

f:id:kanataobslog:20090107065741p:image

We update the data of ON 325. The amplitudes of the flux and the polarization degree have recently been small.

[]3C 273 : the light curve and the polarization degree in V band

f:id:kanataobslog:20090107060113j:image

We have observed 3C 273 since 11 Dec 2008.

This object has very low polarization degree.

2009-01-06

[]3C 279 : update the data

f:id:kanataobslog:20090107055450j:image

We update the data of 3C 279.

This object has the highest polarization degree in our observation.

[]PKS 0754+100 : active state

f:id:kanataobslog:20090107040648j:image

We have observed PKS 0754+100 since 5 November 2008.

This object has recently been active.

The object has brightened by about 1.8 mag for two month.

[]BL Lac : the light curve and polarization degree

f:id:kanataobslog:20090106201125j:image

We continue to observe BL Lacertae,and update data.

This object has violent variabilities.

The figure shows that the light curve and the polarization degree in V band.

It seems that there is no definite correlation between light curve and polarization degree.

2009-01-04

[]OJ 287 : increasing of polarization degree

f:id:kanataobslog:20090105021358p:image

The figure shows the light curve and the polarization degree of OJ 287

in V band. The polarization degree has increased since JD 2454825 but

the flux has not increased. There might be the time-lag between the

flux and the polarization.

[]QSO 0133+476 : fading

f:id:kanataobslog:20090105021247p:image

We continue the observation of QSO 0133+476. The object tends to be

fading with a decrease of the polarization degree.

[]PKS 0048-097 : update the data

f:id:kanataobslog:20090105020730p:image

We update the data of PKS 0048-097. The polarization degree seems to

correlate with the flux.

[]AO 0235+164 : update the data

f:id:kanataobslog:20090105020558p:image

We update the data of AO 0235+164. The object is still faint.

2009-01-02

[]S5 0716+714 : update the data

f:id:kanataobslog:20090103035823p:image

We continue the observation of S5 0716+714. The flux of the object has decreased by about 1.4 mag. but the polarization degree oscillate between 2% and 8%.

[]3C 279 : update the data

f:id:kanataobslog:20090103035722p:image

We update the data of 3C 279. The object has still high polarization degrees.