大溪天文台觀測日誌 TYGA TW
大溪天文台 TYGA TW(AAVSO)觀測 SN 2023ixf in M101 超新星亮度例行觀測2023年08月21日 大溪 晴 風速: 0-1 級 溫度 30.2 度c 濕度:68% 視狀:1.74arcsec
Celestron 14" SCT F/3.6 (f 1288mm 1.1 arcsec/pixel resolution) +SBIG ST-10XME 自由追蹤 (POLEMASTER 2017 0805 校對) Showa 20E kai +NS5000 for SHOWA20E(測試中).+TheSky GOTO system.
#.0.33 reducer: NextGen MAXfield NGM 0.33X Telecompressor Lens
Observations submitted since last login: 2023 0525 - 0527
SN2023 ixf RA=10h03m39.7s Dec=+54d18'46" photometry and astrometry by astroart5.0
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Name JD CalendarDate Mag Filter Chart/Soft
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1 SN 2023ixf 2460090.0375 2023 May 25.5375 11.0 Johnson V ensemble ASTROART5.0 N
2 SN 2023ixf 2460090.04028 2023 May 25.5403 11.1 Cousins R ensemble ASTROART5.0 N
3 SN 2023ixf 2460090.04514 2023 May 25.5451 11.2 Johnson B ensemble ASTROART5.0 N
4 SN 2023ixf 2460091.02431 2023 May 26.5243 11.2 Johnson V ensemble ASTROART5.0 N
5 SN 2023ixf 2460091.02708 2023 May 26.5271 11.0 Cousins R ensemble ASTROART5.0 N
6 SN 2023ixf 2460091.03194 2023 May 26.5319 11.1 Johnson B ensemble ASTROART5.0 N
7 SN 2023ixf 2460092.05278 2023 May 27.5528 11.3 Johnson V ensemble ASTROART5.0 N
8 SN 2023ixf 2460092.05694 2023 May 27.5569 10.9 Cousins R ensemble ASTROART5.0 N
9 SN 2023ixf 2460092.06181 2023 May 27.5618 11.0 Johnson B ensemble ASTROART5.0 N
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Color index:
0525 B-V=+0.2 V-R=-0.1
0526 B-V=-0.1. V-R=+0.2
0527 B-V=-0.3. V-R=+0.4
Observations submitted since last login:2023 0603
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Name JD CalendarDate Mag Filter Chart
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1 SN 2023ixf 2460098.07917 2023 Jun 2.5792 11.1 Johnson V ensemble ASTROART5.0 N
2 SN 2023ixf 2460099.02361 2023 Jun 3.5236 11.1 Johnson V ensemble ASTROART5.0 N
3 SN 2023ixf 2460099.02986 2023 Jun 3.5299 10.9 Cousins R ensemble ASTROART5.0 N
4 SN 2023ixf 2460099.02639 2023 Jun 3.5264 11.5 Johnson B ensemble ASTROART5.0 N
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Color index:
0603 B-V=+0.4 V-R=+0.2
Observations submitted since last login:2023 0619
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Name JD CalendarDate Mag Filter Chart
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1 SN 2023ixf 2460115.21181 2023 Jun 19.7118 11.6 Johnson V ensemble ASTROART5.0 N
2 SN 2023ixf 2460115.21528 2023 Jun 19.7153 12.3 Johnson B ensemble ASTROART5.0 N
3 SN 2023ixf 2460117.15833 2023 Jun 21.6583 12.2 Johnson V ensemble ASTROART5.0 N*
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Color index:
06019 B-V=+0.7
Observations submitted since last login:2023 0708
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Name JD CalendarDate Mag Filter Chart
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1 SN 2023ixf 2460133.98264 2023 Jul 8.4826 12.0 Johnson V ensemble ASTROART5.0 N
2 SN 2023ixf 2460133.98958 2023 Jul 8.4896 12.9 Johnson B ensemble ASTROART5.0 N
3 SN 2023ixf 2460133.99653 2023 Jul 8.4965 11.8 Cousins R ensemble ASTROART5.0 N
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Color index:
0708 B-V=+0.9
Observations submitted since last login:2023 0722
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Name JD CalendarDate Mag Filter Chart
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1 SN 2023ixf 2460147.96319 2023 Jul 22.4632 12.3 Johnson V ensemble ASTROART5.0 N
2 SN 2023ixf 2460147.96875 2023 Jul 22.4688 13.3 Johnson B ensemble ASTROART5.0 N
3 SN 2023ixf 2460147.97222 2023 Jul 22.4722 11.8 Cousins R ensemble ASTROART5.0 N
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Color index:
0722 B-V=+1.0 V-R=+0.6
Observations submitted since last login:2023 0813
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Name JD CalendarDate Mag Filter Chart
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1 SN 2023ixf 2460170.01042 2023 Aug 13.5104 14.1 Johnson V ensemble ASTROART5.0 N
2 SN 2023ixf 2460170.01181 2023 Aug 13.5118 15.3 Johnson B ensemble ASTROART5.0 N
3 SN 2023ixf 2460170.01319 2023 Aug 13.5132 13.2 Cousins R ensemble ASTROART5.0 N
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Color index:
0722 B-V=+1.2 V-R=+0.9
Observations submitted since last login:
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Name JD CalendarDate Mag Filter Chart
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1 SN 2023ixf 2460178.01042 2023 Aug 21.5104 14.8 Johnson V ensemble ASTROART5.0 N
2 SN 2023ixf 2460178.0125 2023 Aug 21.5125 15.5 Johnson B ensemble ASTROART5.0 N
3 SN 2023ixf 2460178.01458 2023 Aug 21.5146 13.4 Cousins R ensemble ASTROART5.0 N
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Color index:
0722 B-V=+0.7 V-R=+1.4
#.SN2023 ixf 爆發後, 為 SN II Type超新星，其藍色光星等會逐漸地變暗。其曲線變化為最後一圖
天文學家理論認為， SNII -L的較線性曲線表現可能僅僅是因為SNII -L 的恆星氫氣包覆要小得多。
這次觀測SN2023 ixf 雖屬 II Type，但光度的變化還是早期階段，還是要靠未來段觀測才可判定是走II -P 還是II-L 曲線。
This graph of the luminosity as a function of time shows the characteristic shapes of the light curves for a Type II-L and II-P supernova.
https://en.wikipedia.org/wiki/Type_II_supernova大溪天文台初步觀測 2023 SNixf 超新星的簡單報告和相關文獻:Multiband Photometry Evolution in the First Weeks of SN 2023ixf
a possible II-L Subtype
Figure 3. The rise and the decline brightness decline of SN 2023ixf . The slope of the decrease in brightness of the observed
SNe is different in each color band, becoming steadily shallower as we move to redder wavelengths. For clarity, error bars are
not plotted The response differences seen in each filter applied to the observation of the supernova SN 2023ixf, led to an analysis
of the differences between photometric filters as ‘colour indexes”. This study focused on the comparison of B-V and
V-R indices, shown in Figure 4.
In Figure clearly appears a huge variation of the B-V colour indices during the first 50 days after explosion from
-0.20 ± 0.02 to +0.85 ± 0.02 and, similarly, V-R behaviour change from 0 ± 0.01 to +0.50 ± 0.01, presumably linked
to the cooling of the stellar photosphere.
Interestingly,the measurements show a point corresponding to May 25, 2023 (JD = 2460089.622) where B-V = V-R
= 0.024. Next, we see an increasing trend as would be expected from a hot blackbody which is cooling, to the extent
where most of the brightness in the B band has shifted towards the V and R bands .
由SN 2023ixf 的色指數研究的重點是B-V和V-R 兩色指數的比較，如圖所示。 在圖中，爆炸後的前50天，B-V 色指數明顯發生了巨大變化，從-0.20±0.02變化到+0.85±0.02! 類似地 V-R的變化曲線也從0±0.01變化到+0.50±0.01! 這可能與恒星爆發後的冷卻有關。
有趣的是，量測結果顯示了一個對應於2023年5月25日的點（JD=2460089.622），其中B-V=V-R=0.024 兩色指數曲線相交及反轉(b-v/v-r curve intersection and inversion)。 接下來，我們觀測到了一個新的趨勢，正如預期的那樣(possible II-L Subtype Supernova)
熱的黑體正在冷卻，B波段的大部分亮度已經向V和R波段轉移（Peebles 1965）。
大溪天文台在5月25,26,27日(JD2460090-2460092)開始觀測的連續三天也觀測到類似的兩色指數(B-V/V-R)曲線相交及反轉(b-v/v-r curve intersection and inversion).
曹大貓咪 2023 0824 台北市
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